20510553504 has 96 divisors (see below), whose sum is σ = 64770209280. Its totient is φ = 5551725312.

The previous prime is 20510553493. The next prime is 20510553517. The reversal of 20510553504 is 40535501502.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

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, 790434 + ... + 815969.

It is an arithmetic number, because the mean of its divisors is an integer number (674689680).

Almost surely, 2^20510553504 is an apocalyptic number.

20510553504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20510553504 is an abundant number, since it is smaller than the sum of its proper divisors (44259655776).

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

20510553504 is a wasteful number, since it uses less digits than its factorization.

20510553504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606442 (or 1606434 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 30.

The spelling of 20510553504 in words is "twenty billion, five hundred ten million, five hundred fifty-three thousand, five hundred four".