20864573 has 2 divisors, whose sum is σ = 20864574. Its totient is φ = 20864572.

The previous prime is 20864539. The next prime is 20864587. The reversal of 20864573 is 37546802.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20457529 + 407044 = 4523^2 + 638^2 .

It is a cyclic number.

It is not a de Polignac number, because 20864573 - 2²⁴ = 4087357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20864513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10432286 + 10432287.

It is an arithmetic number, because the mean of its divisors is an integer number (10432287).

Almost surely, 2^20864573 is an apocalyptic number.

It is an amenable number.

20864573 is a deficient number, since it is larger than the sum of its proper divisors (1).

20864573 is an equidigital number, since it uses as much as digits as its factorization.

20864573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 20864573 is about 4567.7754979859. The cubic root of 20864573 is about 275.2980701959.

The spelling of 20864573 in words is "twenty million, eight hundred sixty-four thousand, five hundred seventy-three".