20646504532 has 24 divisors (see below), whose sum is σ = 37118874240. Its totient is φ = 10041276960.

The previous prime is 20646504523. The next prime is 20646504551. The reversal of 20646504532 is 23540564602.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a junction number, because it is equal to n+sod(n) for n = 20646504491 and 20646504500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 531657 + ... + 569167.

It is an arithmetic number, because the mean of its divisors is an integer number (1546619760).

Almost surely, 2^20646504532 is an apocalyptic number.

It is an amenable number.

20646504532 is a deficient number, since it is larger than the sum of its proper divisors (16472369708).

20646504532 is a wasteful number, since it uses less digits than its factorization.

20646504532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41271 (or 41269 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 37.

The spelling of 20646504532 in words is "twenty billion, six hundred forty-six million, five hundred four thousand, five hundred thirty-two".