20937975 has 12 divisors (see below), whose sum is σ = 34617576. Its totient is φ = 11166880.

The previous prime is 20937953. The next prime is 20938013. The reversal of 20937975 is 57973902.

It is not a de Polignac number, because 20937975 - 2⁹ = 20937463 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 139512 + ... + 139661.

It is an arithmetic number, because the mean of its divisors is an integer number (2884798).

Almost surely, 2^20937975 is an apocalyptic number.

20937975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20937975 is a deficient number, since it is larger than the sum of its proper divisors (13679601).

20937975 is a wasteful number, since it uses less digits than its factorization.

20937975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279186 (or 279181 counting only the distinct ones).

The product of its (nonzero) digits is 119070, while the sum is 42.

The square root of 20937975 is about 4575.8032081811. The cubic root of 20937975 is about 275.6205271254.

It can be divided in two parts, 20937 and 975, that added together give a palindrome (21912).

The spelling of 20937975 in words is "twenty million, nine hundred thirty-seven thousand, nine hundred seventy-five".