20432957 has 2 divisors, whose sum is σ = 20432958. Its totient is φ = 20432956.

The previous prime is 20432933. The next prime is 20432969. The reversal of 20432957 is 75923402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19307236 + 1125721 = 4394^2 + 1061^2 .

It is a cyclic number.

It is not a de Polignac number, because 20432957 - 2⁸ = 20432701 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20432977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10216478 + 10216479.

It is an arithmetic number, because the mean of its divisors is an integer number (10216479).

Almost surely, 2^20432957 is an apocalyptic number.

It is an amenable number.

20432957 is a deficient number, since it is larger than the sum of its proper divisors (1).

20432957 is an equidigital number, since it uses as much as digits as its factorization.

20432957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 20432957 is about 4520.2828451326. The cubic root of 20432957 is about 273.3865054531.

The spelling of 20432957 in words is "twenty million, four hundred thirty-two thousand, nine hundred fifty-seven".