20620465 has 4 divisors (see below), whose sum is σ = 24744564. Its totient is φ = 16496368.

The previous prime is 20620429. The next prime is 20620469. The reversal of 20620465 is 56402602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9006001 + 11614464 = 3001^2 + 3408^2 .

It is a cyclic number.

It is not a de Polignac number, because 20620465 - 2²¹ = 18523313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20620469) 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, 2062042 + ... + 2062051.

It is an arithmetic number, because the mean of its divisors is an integer number (6186141).

Almost surely, 2^20620465 is an apocalyptic number.

It is an amenable number.

20620465 is a deficient number, since it is larger than the sum of its proper divisors (4124099).

20620465 is an equidigital number, since it uses as much as digits as its factorization.

20620465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4124098.

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

The square root of 20620465 is about 4540.9762166301. The cubic root of 20620465 is about 274.2202262713.

The spelling of 20620465 in words is "twenty million, six hundred twenty thousand, four hundred sixty-five".