20939057 has 2 divisors, whose sum is σ = 20939058. Its totient is φ = 20939056.

The previous prime is 20939033. The next prime is 20939059. The reversal of 20939057 is 75093902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18011536 + 2927521 = 4244^2 + 1711^2 .

It is a cyclic number.

It is not a de Polignac number, because 20939057 - 2¹² = 20934961 is a prime.

Together with 20939059, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20939059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10469528 + 10469529.

It is an arithmetic number, because the mean of its divisors is an integer number (10469529).

Almost surely, 2^20939057 is an apocalyptic number.

It is an amenable number.

20939057 is a deficient number, since it is larger than the sum of its proper divisors (1).

20939057 is an equidigital number, since it uses as much as digits as its factorization.

20939057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17010, while the sum is 35.

The square root of 20939057 is about 4575.9214372627. The cubic root of 20939057 is about 275.6252747395.

The spelling of 20939057 in words is "twenty million, nine hundred thirty-nine thousand, fifty-seven".