20764857 has 16 divisors (see below), whose sum is σ = 28365120. Its totient is φ = 13508352.

The previous prime is 20764847. The next prime is 20764859. The reversal of 20764857 is 75846702.

It is not a de Polignac number, because 20764857 - 2¹⁴ = 20748473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20764859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21693 + ... + 22629.

It is an arithmetic number, because the mean of its divisors is an integer number (1772820).

Almost surely, 2^20764857 is an apocalyptic number.

It is an amenable number.

20764857 is a deficient number, since it is larger than the sum of its proper divisors (7600263).

20764857 is an equidigital number, since it uses as much as digits as its factorization.

20764857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112.

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 20764857 is about 4556.8472653799. The cubic root of 20764857 is about 274.8588013432.

The spelling of 20764857 in words is "twenty million, seven hundred sixty-four thousand, eight hundred fifty-seven".