20700057 has 16 divisors (see below), whose sum is σ = 32396672. Its totient is φ = 11508480.

The previous prime is 20700049. The next prime is 20700059. The reversal of 20700057 is 75000702.

It is not a de Polignac number, because 20700057 - 2³ = 20700049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (20700059) 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, 12544 + ... + 14097.

It is an arithmetic number, because the mean of its divisors is an integer number (2024792).

Almost surely, 2^20700057 is an apocalyptic number.

It is an amenable number.

20700057 is a deficient number, since it is larger than the sum of its proper divisors (11696615).

20700057 is a wasteful number, since it uses less digits than its factorization.

20700057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26688.

The product of its (nonzero) digits is 490, while the sum is 21.

The square root of 20700057 is about 4549.7315305411. The cubic root of 20700057 is about 274.5725900504.

Adding to 20700057 its reverse (75000702), we get a palindrome (95700759).

The spelling of 20700057 in words is "twenty million, seven hundred thousand, fifty-seven".