20607857 has 2 divisors, whose sum is σ = 20607858. Its totient is φ = 20607856.

The previous prime is 20607841. The next prime is 20607863. The reversal of 20607857 is 75870602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16982641 + 3625216 = 4121^2 + 1904^2 .

It is a cyclic number.

It is not a de Polignac number, because 20607857 - 2⁴ = 20607841 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20607817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10303928 + 10303929.

It is an arithmetic number, because the mean of its divisors is an integer number (10303929).

Almost surely, 2^20607857 is an apocalyptic number.

It is an amenable number.

20607857 is a deficient number, since it is larger than the sum of its proper divisors (1).

20607857 is an equidigital number, since it uses as much as digits as its factorization.

20607857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 20607857 is about 4539.5877566140. The cubic root of 20607857 is about 274.1643259235.

The spelling of 20607857 in words is "twenty million, six hundred seven thousand, eight hundred fifty-seven".