2101020 has 72 divisors (see below), whose sum is σ = 6272784. Its totient is φ = 525312.

The previous prime is 2101019. The next prime is 2101051. The reversal of 2101020 is 201012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21612 + ... + 21708.

It is an arithmetic number, because the mean of its divisors is an integer number (87122).

2^2101020 is an apocalyptic number.

2101020 is a gapful number since it is divisible by the number (20) 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 2101020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3136392).

2101020 is an abundant number, since it is smaller than the sum of its proper divisors (4171764).

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

2101020 is a wasteful number, since it uses less digits than its factorization.

2101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 2101020 is about 1449.4895653298. The cubic root of 2101020 is about 128.0786463293.

Adding to 2101020 its reverse (201012), we get a palindrome (2302032).

The spelling of 2101020 in words is "two million, one hundred one thousand, twenty".