20857713525 has 144 divisors (see below), whose sum is σ = 43309513728. Its totient is φ = 9483264000.

The previous prime is 20857713511. The next prime is 20857713551. The reversal of 20857713525 is 52531775802.

20857713525 is a `hidden beast` number, since 2 + 0 + 8 + 57 + 71 + 3 + 525 = 666.

It is not a de Polignac number, because 20857713525 - 2⁴ = 20857713509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 14178540 + ... + 14180010.

It is an arithmetic number, because the mean of its divisors is an integer number (300760512).

Almost surely, 2^20857713525 is an apocalyptic number.

20857713525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20857713525 is an abundant number, since it is smaller than the sum of its proper divisors (22451800203).

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

20857713525 is a wasteful number, since it uses less digits than its factorization.

20857713525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852 (or 1844 counting only the distinct ones).

The product of its (nonzero) digits is 588000, while the sum is 45.

The spelling of 20857713525 in words is "twenty billion, eight hundred fifty-seven million, seven hundred thirteen thousand, five hundred twenty-five".