22020557 has 4 divisors (see below), whose sum is σ = 23714460. Its totient is φ = 20326656.

The previous prime is 22020547. The next prime is 22020569. The reversal of 22020557 is 75502022.

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 1779556 + 20241001 = 1334^2 + 4499^2 .

It is a cyclic number.

It is not a de Polignac number, because 22020557 - 2²² = 17826253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22020517) 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, 846932 + ... + 846957.

It is an arithmetic number, because the mean of its divisors is an integer number (5928615).

Almost surely, 2^22020557 is an apocalyptic number.

It is an amenable number.

22020557 is a deficient number, since it is larger than the sum of its proper divisors (1693903).

22020557 is a wasteful number, since it uses less digits than its factorization.

22020557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1693902.

The product of its (nonzero) digits is 1400, while the sum is 23.

The square root of 22020557 is about 4692.6066317133. The cubic root of 22020557 is about 280.2911809302.

Adding to 22020557 its reverse (75502022), we get a palindrome (97522579).

The spelling of 22020557 in words is "twenty-two million, twenty thousand, five hundred fifty-seven".