20264605 has 4 divisors (see below), whose sum is σ = 24317532. Its totient is φ = 16211680.

The previous prime is 20264599. The next prime is 20264609. The reversal of 20264605 is 50646202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50646202 = 2 ⋅25323101.

It can be written as a sum of positive squares in 2 ways, for example, as 4756761 + 15507844 = 2181^2 + 3938^2 .

It is not a de Polignac number, because 20264605 - 2³ = 20264597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20264605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20264609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2026456 + ... + 2026465.

It is an arithmetic number, because the mean of its divisors is an integer number (6079383).

Almost surely, 2^20264605 is an apocalyptic number.

It is an amenable number.

20264605 is a deficient number, since it is larger than the sum of its proper divisors (4052927).

20264605 is an equidigital number, since it uses as much as digits as its factorization.

20264605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4052926.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20264605 is about 4501.6224852824. The cubic root of 20264605 is about 272.6336016866.

The spelling of 20264605 in words is "twenty million, two hundred sixty-four thousand, six hundred five".