20857265715 has 32 divisors (see below), whose sum is σ = 39205829376. Its totient is φ = 9334719360.

The previous prime is 20857265687. The next prime is 20857265771. The reversal of 20857265715 is 51756275802.

It is not a de Polignac number, because 20857265715 - 2⁸ = 20857265459 is a prime.

It is a super-2 number, since 2×20857265715² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4859689 + ... + 4863978.

It is an arithmetic number, because the mean of its divisors is an integer number (1225182168).

Almost surely, 2^20857265715 is an apocalyptic number.

20857265715 is a deficient number, since it is larger than the sum of its proper divisors (18348563661).

20857265715 is a wasteful number, since it uses less digits than its factorization.

20857265715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9723699.

The product of its (nonzero) digits is 1176000, while the sum is 48.

The spelling of 20857265715 in words is "twenty billion, eight hundred fifty-seven million, two hundred sixty-five thousand, seven hundred fifteen".