20654657 has 4 divisors (see below), whose sum is σ = 20683200. Its totient is φ = 20626116.

The previous prime is 20654617. The next prime is 20654659. The reversal of 20654657 is 75645602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20654657 - 2²⁴ = 3877441 is a prime.

It is a super-2 number, since 2×20654657² = 853229711575298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20654659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13157 + ... + 14642.

It is an arithmetic number, because the mean of its divisors is an integer number (5170800).

Almost surely, 2^20654657 is an apocalyptic number.

It is an amenable number.

20654657 is a deficient number, since it is larger than the sum of its proper divisors (28543).

20654657 is an equidigital number, since it uses as much as digits as its factorization.

20654657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28542.

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 20654657 is about 4544.7394864832. The cubic root of 20654657 is about 274.3717094438.

The spelling of 20654657 in words is "twenty million, six hundred fifty-four thousand, six hundred fifty-seven".