20221002 has 72 divisors (see below), whose sum is σ = 48181536. Its totient is φ = 6351048.

The previous prime is 20220983. The next prime is 20221009. The reversal of 20221002 is 20012202.

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

It is not an unprimeable number, because it can be changed into a prime (20221009) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 301773 + ... + 301839.

It is an arithmetic number, because the mean of its divisors is an integer number (669188).

Almost surely, 2^20221002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20221002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24090768).

20221002 is an abundant number, since it is smaller than the sum of its proper divisors (27960534).

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

20221002 is an frugal number, since it uses more digits than its factorization.

20221002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 20221002 is about 4496.7768456974. The cubic root of 20221002 is about 272.4379209371.

Adding to 20221002 its reverse (20012202), we get a palindrome (40233204).

The spelling of 20221002 in words is "twenty million, two hundred twenty-one thousand, two".