20604457 has 2 divisors, whose sum is σ = 20604458. Its totient is φ = 20604456.

The previous prime is 20604433. The next prime is 20604499. The reversal of 20604457 is 75440602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20602521 + 1936 = 4539^2 + 44^2 .

It is a cyclic number.

It is not a de Polignac number, because 20604457 - 2¹¹ = 20602409 is a prime.

It is not a weakly prime, because it can be changed into another prime (20604407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10302228 + 10302229.

It is an arithmetic number, because the mean of its divisors is an integer number (10302229).

Almost surely, 2^20604457 is an apocalyptic number.

It is an amenable number.

20604457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20604457 is an equidigital number, since it uses as much as digits as its factorization.

20604457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 20604457 is about 4539.2132578234. The cubic root of 20604457 is about 274.1492473707.

The spelling of 20604457 in words is "twenty million, six hundred four thousand, four hundred fifty-seven".