20021022 has 48 divisors (see below), whose sum is σ = 52191360. Its totient is φ = 5418576.

The previous prime is 20021021. The next prime is 20021059. The reversal of 20021022 is 22012002.

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 = 20020995 and 20021013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1788 + ... + 6575.

It is an arithmetic number, because the mean of its divisors is an integer number (1087320).

Almost surely, 2^20021022 is an apocalyptic number.

20021022 is an abundant number, since it is smaller than the sum of its proper divisors (32170338).

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

20021022 is a wasteful number, since it uses less digits than its factorization.

20021022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8397 (or 8394 counting only the distinct ones).

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

The square root of 20021022 is about 4474.4856687669. The cubic root of 20021022 is about 271.5368325028.

Adding to 20021022 its reverse (22012002), we get a palindrome (42033024).

The spelling of 20021022 in words is "twenty million, twenty-one thousand, twenty-two".