20624320664 has 32 divisors (see below), whose sum is σ = 39744285120. Its totient is φ = 10026245376.

The previous prime is 20624320657. The next prime is 20624320699. The reversal of 20624320664 is 46602342602.

It is a congruent 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, 399857 + ... + 448479.

It is an arithmetic number, because the mean of its divisors is an integer number (1242008910).

Almost surely, 2^20624320664 is an apocalyptic number.

It is an amenable number.

20624320664 is a deficient number, since it is larger than the sum of its proper divisors (19119964456).

20624320664 is a wasteful number, since it uses less digits than its factorization.

20624320664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50099 (or 50095 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 35.

The spelling of 20624320664 in words is "twenty billion, six hundred twenty-four million, three hundred twenty thousand, six hundred sixty-four".