20622565 has 16 divisors (see below), whose sum is σ = 25660800. Its totient is φ = 15900352.

The previous prime is 20622529. The next prime is 20622583. The reversal of 20622565 is 56522602.

It is a cyclic number.

It is not a de Polignac number, because 20622565 - 2¹⁹ = 20098277 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14976 + ... + 16294.

It is an arithmetic number, because the mean of its divisors is an integer number (1603800).

Almost surely, 2^20622565 is an apocalyptic number.

It is an amenable number.

20622565 is a deficient number, since it is larger than the sum of its proper divisors (5038235).

20622565 is a wasteful number, since it uses less digits than its factorization.

20622565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 20622565 is about 4541.2074385564. The cubic root of 20622565 is about 274.2295348705.

The spelling of 20622565 in words is "twenty million, six hundred twenty-two thousand, five hundred sixty-five".