20022565 has 4 divisors (see below), whose sum is σ = 24027084. Its totient is φ = 16018048.

The previous prime is 20022553. The next prime is 20022571. The reversal of 20022565 is 56522002.

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 12716356 + 7306209 = 3566^2 + 2703^2 .

It is a cyclic number.

It is not a de Polignac number, because 20022565 - 2⁷ = 20022437 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2002252 + ... + 2002261.

It is an arithmetic number, because the mean of its divisors is an integer number (6006771).

Almost surely, 2^20022565 is an apocalyptic number.

It is an amenable number.

20022565 is a deficient number, since it is larger than the sum of its proper divisors (4004519).

20022565 is an equidigital number, since it uses as much as digits as its factorization.

20022565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4004518.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20022565 is about 4474.6580874967. The cubic root of 20022565 is about 271.5438080137.

Adding to 20022565 its reverse (56522002), we get a palindrome (76544567).

The spelling of 20022565 in words is "twenty million, twenty-two thousand, five hundred sixty-five".