20538975 has 48 divisors (see below), whose sum is σ = 36560160. Its totient is φ = 10137600.

The previous prime is 20538967. The next prime is 20538983. The reversal of 20538975 is 57983502.

It is an interprime number because it is at equal distance from previous prime (20538967) and next prime (20538983).

It is not a de Polignac number, because 20538975 - 2³ = 20538967 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 113385 + ... + 113565.

It is an arithmetic number, because the mean of its divisors is an integer number (761670).

Almost surely, 2^20538975 is an apocalyptic number.

20538975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20538975 is a deficient number, since it is larger than the sum of its proper divisors (16021185).

20538975 is a wasteful number, since it uses less digits than its factorization.

20538975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 20538975 is about 4531.9945939950. The cubic root of 20538975 is about 273.8585191406.

The spelling of 20538975 in words is "twenty million, five hundred thirty-eight thousand, nine hundred seventy-five".