20642875 has 16 divisors (see below), whose sum is σ = 28106208. Its totient is φ = 15012000.

The previous prime is 20642857. The next prime is 20642899. The reversal of 20642875 is 57824602.

It is not a de Polignac number, because 20642875 - 2¹¹ = 20640827 is a prime.

It is a super-2 number, since 2×20642875² = 852256576531250, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20642875.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6132 + ... + 8881.

It is an arithmetic number, because the mean of its divisors is an integer number (1756638).

Almost surely, 2^20642875 is an apocalyptic number.

20642875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20642875 is a deficient number, since it is larger than the sum of its proper divisors (7463333).

20642875 is a wasteful number, since it uses less digits than its factorization.

20642875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15039 (or 15029 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 20642875 is about 4543.4430776670. The cubic root of 20642875 is about 274.3195297290.

The spelling of 20642875 in words is "twenty million, six hundred forty-two thousand, eight hundred seventy-five".