20652479778 has 32 divisors (see below), whose sum is σ = 47469404160. Its totient is φ = 5867741520.

The previous prime is 20652479671. The next prime is 20652479797. The reversal of 20652479778 is 87797425602.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

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, 1366018 + ... + 1381053.

It is an arithmetic number, because the mean of its divisors is an integer number (1483418880).

Almost surely, 2^20652479778 is an apocalyptic number.

20652479778 is an abundant number, since it is smaller than the sum of its proper divisors (26816924382).

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

20652479778 is a wasteful number, since it uses less digits than its factorization.

20652479778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2747262.

The product of its (nonzero) digits is 11854080, while the sum is 57.

The spelling of 20652479778 in words is "twenty billion, six hundred fifty-two million, four hundred seventy-nine thousand, seven hundred seventy-eight".