20792657 has 2 divisors, whose sum is σ = 20792658. Its totient is φ = 20792656.

The previous prime is 20792647. The next prime is 20792671. The reversal of 20792657 is 75629702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19989841 + 802816 = 4471^2 + 896^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20792657 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20792657.

It is not a weakly prime, because it can be changed into another prime (20792647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10396328 + 10396329.

It is an arithmetic number, because the mean of its divisors is an integer number (10396329).

Almost surely, 2^20792657 is an apocalyptic number.

It is an amenable number.

20792657 is a deficient number, since it is larger than the sum of its proper divisors (1).

20792657 is an equidigital number, since it uses as much as digits as its factorization.

20792657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 20792657 is about 4559.8965997049. The cubic root of 20792657 is about 274.9814070074.

The spelling of 20792657 in words is "twenty million, seven hundred ninety-two thousand, six hundred fifty-seven".