20578475136 has 64 divisors (see below), whose sum is σ = 54687585600. Its totient is φ = 6856227840.

The previous prime is 20578475123. The next prime is 20578475143. The reversal of 20578475136 is 63157487502.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 875830 + ... + 899018.

It is an arithmetic number, because the mean of its divisors is an integer number (854493525).

Almost surely, 2^20578475136 is an apocalyptic number.

It is an amenable number.

20578475136 is an abundant number, since it is smaller than the sum of its proper divisors (34109110464).

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

20578475136 is a wasteful number, since it uses less digits than its factorization.

20578475136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25517 (or 25505 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 48.

The spelling of 20578475136 in words is "twenty billion, five hundred seventy-eight million, four hundred seventy-five thousand, one hundred thirty-six".