20578540356 has 72 divisors (see below), whose sum is σ = 56777613984. Its totient is φ = 6232544640.

The previous prime is 20578540319. The next prime is 20578540361. The reversal of 20578540356 is 65304587502.

20578540356 is a `hidden beast` number, since 2 + 0 + 5 + 78 + 540 + 35 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 773776 + ... + 799928.

It is an arithmetic number, because the mean of its divisors is an integer number (788577972).

Almost surely, 2^20578540356 is an apocalyptic number.

It is an amenable number.

20578540356 is an abundant number, since it is smaller than the sum of its proper divisors (36199073628).

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

20578540356 is a wasteful number, since it uses less digits than its factorization.

20578540356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28161 (or 28156 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 45.

The spelling of 20578540356 in words is "twenty billion, five hundred seventy-eight million, five hundred forty thousand, three hundred fifty-six".