20204957 has 2 divisors, whose sum is σ = 20204958. Its totient is φ = 20204956.

The previous prime is 20204953. The next prime is 20204981. The reversal of 20204957 is 75940202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13293316 + 6911641 = 3646^2 + 2629^2 .

It is a cyclic number.

It is not a de Polignac number, because 20204957 - 2² = 20204953 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 (20204953) 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, 10102478 + 10102479.

It is an arithmetic number, because the mean of its divisors is an integer number (10102479).

Almost surely, 2^20204957 is an apocalyptic number.

It is an amenable number.

20204957 is a deficient number, since it is larger than the sum of its proper divisors (1).

20204957 is an equidigital number, since it uses as much as digits as its factorization.

20204957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20204957 is about 4494.9924360337. The cubic root of 20204957 is about 272.3658436792.

The spelling of 20204957 in words is "twenty million, two hundred four thousand, nine hundred fifty-seven".