20231957 has 2 divisors, whose sum is σ = 20231958. Its totient is φ = 20231956.

The previous prime is 20231951. The next prime is 20231977. The reversal of 20231957 is 75913202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18957316 + 1274641 = 4354^2 + 1129^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20231957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20231951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10115978 + 10115979.

It is an arithmetic number, because the mean of its divisors is an integer number (10115979).

Almost surely, 2^20231957 is an apocalyptic number.

It is an amenable number.

20231957 is a deficient number, since it is larger than the sum of its proper divisors (1).

20231957 is an equidigital number, since it uses as much as digits as its factorization.

20231957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 20231957 is about 4497.9947754527. The cubic root of 20231957 is about 272.4871110252.

It can be divided in two parts, 2023195 and 7, that added together give a palindrome (2023202).

The spelling of 20231957 in words is "twenty million, two hundred thirty-one thousand, nine hundred fifty-seven".