20640943152 has 80 divisors (see below), whose sum is σ = 59270016000. Its totient is φ = 6877659456.

The previous prime is 20640943133. The next prime is 20640943171. The reversal of 20640943152 is 25134904602.

It is a happy number.

20640943152 is a `hidden beast` number, since 2 + 0 + 640 + 9 + 4 + 3 + 1 + 5 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (20640943133) and next prime (20640943171).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1339749 + ... + 1355067.

It is an arithmetic number, because the mean of its divisors is an integer number (740875200).

Almost surely, 2^20640943152 is an apocalyptic number.

It is an amenable number.

20640943152 is an abundant number, since it is smaller than the sum of its proper divisors (38629072848).

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

20640943152 is a wasteful number, since it uses less digits than its factorization.

20640943152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18455 (or 18443 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 20640943152 in words is "twenty billion, six hundred forty million, nine hundred forty-three thousand, one hundred fifty-two".