20320611651 has 24 divisors (see below), whose sum is σ = 30037709520. Its totient is φ = 13232846016.

The previous prime is 20320611617. The next prime is 20320611671. The reversal of 20320611651 is 15611602302.

20320611651 is a `hidden beast` number, since 2 + 0 + 3 + 2 + 0 + 6 + 1 + 1 + 651 = 666.

It is not a de Polignac number, because 20320611651 - 2¹⁸ = 20320349507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20320611601) 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, 14445 + ... + 202113.

It is an arithmetic number, because the mean of its divisors is an integer number (1251571230).

Almost surely, 2^20320611651 is an apocalyptic number.

20320611651 is a deficient number, since it is larger than the sum of its proper divisors (9717097869).

20320611651 is a wasteful number, since it uses less digits than its factorization.

20320611651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187955 (or 187952 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The spelling of 20320611651 in words is "twenty billion, three hundred twenty million, six hundred eleven thousand, six hundred fifty-one".