20678241564 has 72 divisors (see below), whose sum is σ = 52695918912. Its totient is φ = 6836797440.

The previous prime is 20678241527. The next prime is 20678241593. The reversal of 20678241564 is 46514287602.

20678241564 is a `hidden beast` number, since 2 + 0 + 6 + 7 + 82 + 4 + 1 + 564 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 2448429 + ... + 2456859.

Almost surely, 2^20678241564 is an apocalyptic number.

It is an amenable number.

20678241564 is an abundant number, since it is smaller than the sum of its proper divisors (32017677348).

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

20678241564 is a wasteful number, since it uses less digits than its factorization.

20678241564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8987 (or 8982 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The spelling of 20678241564 in words is "twenty billion, six hundred seventy-eight million, two hundred forty-one thousand, five hundred sixty-four".