20021000022 has 24 divisors (see below), whose sum is σ = 43382640600. Its totient is φ = 6673080960.

The previous prime is 20020999951. The next prime is 20021000047. The reversal of 20021000022 is 22000012002.

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 = 20020999968 and 20021000013.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 194854 + ... + 279302.

It is an arithmetic number, because the mean of its divisors is an integer number (1807610025).

Almost surely, 2^20021000022 is an apocalyptic number.

20021000022 is an abundant number, since it is smaller than the sum of its proper divisors (23361640578).

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

20021000022 is a wasteful number, since it uses less digits than its factorization.

20021000022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97628 (or 97625 counting only the distinct ones).

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

Adding to 20021000022 its reverse (22000012002), we get a palindrome (42021012024).

The spelling of 20021000022 in words is "twenty billion, twenty-one million, twenty-two", and thus it is an aban number and an uban number.