20900165020 has 36 divisors (see below), whose sum is σ = 51056119800. Its totient is φ = 7165770528.

The previous prime is 20900165009. The next prime is 20900165047. The reversal of 20900165020 is 2056100902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10662370 + ... + 10664329.

It is an arithmetic number, because the mean of its divisors is an integer number (1418225550).

Almost surely, 2^20900165020 is an apocalyptic number.

20900165020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20900165020 is an abundant number, since it is smaller than the sum of its proper divisors (30155954780).

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

20900165020 is a wasteful number, since it uses less digits than its factorization.

20900165020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21326722 (or 21326713 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

Adding to 20900165020 its reverse (2056100902), we get a palindrome (22956265922).

The spelling of 20900165020 in words is "twenty billion, nine hundred million, one hundred sixty-five thousand, twenty".