20315251624 has 8 divisors (see below), whose sum is σ = 38091096810. Its totient is φ = 10157625808.

The previous prime is 20315251559. The next prime is 20315251631. The reversal of 20315251624 is 42615251302.

It can be written as a sum of positive squares in only one way, i.e., 17321192100 + 2994059524 = 131610^2 + 54718^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1269703219 + ... + 1269703234.

Almost surely, 2^20315251624 is an apocalyptic number.

It is an amenable number.

20315251624 is a deficient number, since it is larger than the sum of its proper divisors (17775845186).

20315251624 is a wasteful number, since it uses less digits than its factorization.

20315251624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2539406459 (or 2539406455 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 20315251624 in words is "twenty billion, three hundred fifteen million, two hundred fifty-one thousand, six hundred twenty-four".