20513875 has 16 divisors (see below), whose sum is σ = 26488800. Its totient is φ = 15842400.

The previous prime is 20513839. The next prime is 20513879. The reversal of 20513875 is 57831502.

It is a de Polignac number, because none of the positive numbers 2^k-20513875 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20513879) 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, 796 + ... + 6454.

It is an arithmetic number, because the mean of its divisors is an integer number (1655550).

Almost surely, 2^20513875 is an apocalyptic number.

20513875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20513875 is a deficient number, since it is larger than the sum of its proper divisors (5974925).

20513875 is an equidigital number, since it uses as much as digits as its factorization.

20513875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5703 (or 5693 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 20513875 is about 4529.2245473149. The cubic root of 20513875 is about 273.7469158622.

The spelling of 20513875 in words is "twenty million, five hundred thirteen thousand, eight hundred seventy-five".