20515893656 has 32 divisors (see below), whose sum is σ = 39058953840. Its totient is φ = 10100310528.

The previous prime is 20515893617. The next prime is 20515893659. The reversal of 20515893656 is 65639851502.

It is a super-3 number, since 3×20515893656³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20515893659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1404020 + ... + 1418556.

Almost surely, 2^20515893656 is an apocalyptic number.

It is an amenable number.

20515893656 is a deficient number, since it is larger than the sum of its proper divisors (18543060184).

20515893656 is a wasteful number, since it uses less digits than its factorization.

20515893656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17243 (or 17239 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 50.

The spelling of 20515893656 in words is "twenty billion, five hundred fifteen million, eight hundred ninety-three thousand, six hundred fifty-six".