20519013656 has 16 divisors (see below), whose sum is σ = 38936683800. Its totient is φ = 10135897984.

The previous prime is 20519013629. The next prime is 20519013679. The reversal of 20519013656 is 65631091502.

It is a super-2 number, since 2×20519013656² (a number of 21 digits) contains 22 as substring.

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, 15450401 + ... + 15451728.

Almost surely, 2^20519013656 is an apocalyptic number.

It is an amenable number.

20519013656 is a deficient number, since it is larger than the sum of its proper divisors (18417670144).

20519013656 is a wasteful number, since it uses less digits than its factorization.

20519013656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30902218 (or 30902214 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 38.

The spelling of 20519013656 in words is "twenty billion, five hundred nineteen million, thirteen thousand, six hundred fifty-six".