20131975 has 6 divisors (see below), whose sum is σ = 24963680. Its totient is φ = 16105560.

The previous prime is 20131939. The next prime is 20131981. The reversal of 20131975 is 57913102.

It is not a de Polignac number, because 20131975 - 2¹¹ = 20129927 is a prime.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 402615 + ... + 402664.

Almost surely, 2^20131975 is an apocalyptic number.

20131975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20131975 is a deficient number, since it is larger than the sum of its proper divisors (4831705).

20131975 is an equidigital number, since it uses as much as digits as its factorization.

20131975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805289 (or 805284 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 20131975 is about 4486.8669469910. The cubic root of 20131975 is about 272.0375119472.

The spelling of 20131975 in words is "twenty million, one hundred thirty-one thousand, nine hundred seventy-five".