1111102020 has 144 divisors (see below), whose sum is σ = 3891957888. Its totient is φ = 251320320.

The previous prime is 1111101991. The next prime is 1111102049. The reversal of 1111102020 is 202011111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1111101991) and next prime (1111102049).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1111101993 and 1111102011.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 117675 + ... + 126765.

Almost surely, 2^1111102020 is an apocalyptic number.

1111102020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1111102020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1945978944).

1111102020 is an abundant number, since it is smaller than the sum of its proper divisors (2780855868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1111102020 is a wasteful number, since it uses less digits than its factorization.

1111102020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9210 (or 9205 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1111102020 is about 33333.1969663877. The cubic root of 1111102020 is about 1035.7413438240.

Adding to 1111102020 its reverse (202011111), we get a palindrome (1313113131).

Subtracting from 1111102020 its reverse (202011111), we obtain a palindrome (909090909).

The spelling of 1111102020 in words is "one billion, one hundred eleven million, one hundred two thousand, twenty".