20564807 has 2 divisors, whose sum is σ = 20564808. Its totient is φ = 20564806.

The previous prime is 20564743. The next prime is 20564833. The reversal of 20564807 is 70846502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20564807 - 2⁶ = 20564743 is a prime.

It is a super-2 number, since 2×20564807² = 845822573894498, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20564867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10282403 + 10282404.

It is an arithmetic number, because the mean of its divisors is an integer number (10282404).

Almost surely, 2^20564807 is an apocalyptic number.

20564807 is a deficient number, since it is larger than the sum of its proper divisors (1).

20564807 is an equidigital number, since it uses as much as digits as its factorization.

20564807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 20564807 is about 4534.8436577240. The cubic root of 20564807 is about 273.9732822440.

The spelling of 20564807 in words is "twenty million, five hundred sixty-four thousand, eight hundred seven".