22520997 has 14 divisors (see below), whose sum is σ = 33767142. Its totient is φ = 15013512.

The previous prime is 22520989. The next prime is 22520999. The reversal of 22520997 is 79902522.

It can be written as a sum of positive squares in only one way, i.e., 18198756 + 4322241 = 4266^2 + 2079^2 .

It is not a de Polignac number, because 22520997 - 2³ = 22520989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22520999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 14718 + ... + 16175.

Almost surely, 2^22520997 is an apocalyptic number.

22520997 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

22520997 is a deficient number, since it is larger than the sum of its proper divisors (11246145).

22520997 is an frugal number, since it uses more digits than its factorization.

22520997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30911 (or 30896 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 22520997 is about 4745.6292522699. The cubic root of 22520997 is about 282.3985988436.

The spelling of 22520997 in words is "twenty-two million, five hundred twenty thousand, nine hundred ninety-seven".