20597561052 has 12 divisors (see below), whose sum is σ = 48060975816. Its totient is φ = 6865853680.

The previous prime is 20597561041. The next prime is 20597561077. The reversal of 20597561052 is 25016579502.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20597560995 and 20597561013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 858231699 + ... + 858231722.

It is an arithmetic number, because the mean of its divisors is an integer number (4005081318).

Almost surely, 2^20597561052 is an apocalyptic number.

It is an amenable number.

20597561052 is an abundant number, since it is smaller than the sum of its proper divisors (27463414764).

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

20597561052 is a wasteful number, since it uses less digits than its factorization.

20597561052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1716463428 (or 1716463426 counting only the distinct ones).

The product of its (nonzero) digits is 189000, while the sum is 42.

The spelling of 20597561052 in words is "twenty billion, five hundred ninety-seven million, five hundred sixty-one thousand, fifty-two".