20651331908 has 24 divisors (see below), whose sum is σ = 37749656448. Its totient is φ = 9866633216.

The previous prime is 20651331871. The next prime is 20651331917. The reversal of 20651331908 is 80913315602.

It is a happy number.

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, 23741 + ... + 204612.

It is an arithmetic number, because the mean of its divisors is an integer number (1572902352).

Almost surely, 2^20651331908 is an apocalyptic number.

It is an amenable number.

20651331908 is a deficient number, since it is larger than the sum of its proper divisors (17098324540).

20651331908 is a wasteful number, since it uses less digits than its factorization.

20651331908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229363 (or 229361 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 20651331908 in words is "twenty billion, six hundred fifty-one million, three hundred thirty-one thousand, nine hundred eight".