20953593264 has 20 divisors (see below), whose sum is σ = 54130116056. Its totient is φ = 6984531072.

The previous prime is 20953593211. The next prime is 20953593299. The reversal of 20953593264 is 46239535902.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 436533193 = 20953593264 / (2 + 0 + 9 + 5 + 3 + 5 + 9 + 3 + 2 + 6 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218266549 + ... + 218266644.

Almost surely, 2^20953593264 is an apocalyptic number.

20953593264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20953593264 is an abundant number, since it is smaller than the sum of its proper divisors (33176522792).

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

20953593264 is a wasteful number, since it uses less digits than its factorization.

20953593264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436533204 (or 436533198 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 48.

The spelling of 20953593264 in words is "twenty billion, nine hundred fifty-three million, five hundred ninety-three thousand, two hundred sixty-four".