20857715132 has 12 divisors (see below), whose sum is σ = 36502030656. Its totient is φ = 10428563520.

The previous prime is 20857715111. The next prime is 20857715141. The reversal of 20857715132 is 23151775802.

It is a self number, because there is not a number n which added to its sum of digits gives 20857715132.

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, 195332 + ... + 282612.

It is an arithmetic number, because the mean of its divisors is an integer number (3041835888).

Almost surely, 2^20857715132 is an apocalyptic number.

It is an amenable number.

20857715132 is a deficient number, since it is larger than the sum of its proper divisors (15644315524).

20857715132 is a wasteful number, since it uses less digits than its factorization.

20857715132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147028 (or 147026 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 41.

The spelling of 20857715132 in words is "twenty billion, eight hundred fifty-seven million, seven hundred fifteen thousand, one hundred thirty-two".