20616513560 has 32 divisors (see below), whose sum is σ = 46475897040. Its totient is φ = 8230829184.

The previous prime is 20616513551. The next prime is 20616513571. The reversal of 20616513560 is 6531561602.

It is a self number, because there is not a number n which added to its sum of digits gives 20616513560.

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, 471827 + ... + 513666.

Almost surely, 2^20616513560 is an apocalyptic number.

20616513560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20616513560 is an abundant number, since it is smaller than the sum of its proper divisors (25859383480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20616513560 is a wasteful number, since it uses less digits than its factorization.

20616513560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986027 (or 986023 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 20616513560 in words is "twenty billion, six hundred sixteen million, five hundred thirteen thousand, five hundred sixty".