20631562544 has 20 divisors (see below), whose sum is σ = 39978501480. Its totient is φ = 10314529920.

The previous prime is 20631562531. The next prime is 20631562561. The reversal of 20631562544 is 44526513602.

It is a super-2 number, since 2×20631562544² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20631562498 and 20631562507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65852 + ... + 213540.

It is an arithmetic number, because the mean of its divisors is an integer number (1998925074).

Almost surely, 2^20631562544 is an apocalyptic number.

It is an amenable number.

20631562544 is a deficient number, since it is larger than the sum of its proper divisors (19346938936).

20631562544 is a wasteful number, since it uses less digits than its factorization.

20631562544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156428 (or 156422 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 38.

The spelling of 20631562544 in words is "twenty billion, six hundred thirty-one million, five hundred sixty-two thousand, five hundred forty-four".