20264689 has 2 divisors, whose sum is σ = 20264690. Its totient is φ = 20264688.

The previous prime is 20264609. The next prime is 20264693. The reversal of 20264689 is 98646202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14311089 + 5953600 = 3783^2 + 2440^2 .

It is a cyclic number.

It is not a de Polignac number, because 20264689 - 2¹³ = 20256497 is a prime.

It is not a weakly prime, because it can be changed into another prime (20264609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10132344 + 10132345.

It is an arithmetic number, because the mean of its divisors is an integer number (10132345).

Almost surely, 2^20264689 is an apocalyptic number.

It is an amenable number.

20264689 is a deficient number, since it is larger than the sum of its proper divisors (1).

20264689 is an equidigital number, since it uses as much as digits as its factorization.

20264689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 20264689 is about 4501.6318152421. The cubic root of 20264689 is about 272.6339783892.

The spelling of 20264689 in words is "twenty million, two hundred sixty-four thousand, six hundred eighty-nine".