20902991210 has 16 divisors (see below), whose sum is σ = 37637247456. Its totient is φ = 8358560208.

The previous prime is 20902991191. The next prime is 20902991251. The reversal of 20902991210 is 1219920902.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296072 + ... + 359811.

It is an arithmetic number, because the mean of its divisors is an integer number (2352327966).

Almost surely, 2^20902991210 is an apocalyptic number.

20902991210 is a deficient number, since it is larger than the sum of its proper divisors (16734256246).

20902991210 is a wasteful number, since it uses less digits than its factorization.

20902991210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659077.

The product of its (nonzero) digits is 5832, while the sum is 35.

The spelling of 20902991210 in words is "twenty billion, nine hundred two million, nine hundred ninety-one thousand, two hundred ten".