22820857 has 2 divisors, whose sum is σ = 22820858. Its totient is φ = 22820856.

The previous prime is 22820839. The next prime is 22820873. The reversal of 22820857 is 75802822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12702096 + 10118761 = 3564^2 + 3181^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22820857 is a prime.

It is not a weakly prime, because it can be changed into another prime (22820827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11410428 + 11410429.

It is an arithmetic number, because the mean of its divisors is an integer number (11410429).

Almost surely, 2^22820857 is an apocalyptic number.

It is an amenable number.

22820857 is a deficient number, since it is larger than the sum of its proper divisors (1).

22820857 is an equidigital number, since it uses as much as digits as its factorization.

22820857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 22820857 is about 4777.1180642726. The cubic root of 22820857 is about 283.6464265196.

The spelling of 22820857 in words is "twenty-two million, eight hundred twenty thousand, eight hundred fifty-seven".