23420997 has 6 divisors (see below), whose sum is σ = 33830342. Its totient is φ = 15613992.

The previous prime is 23420933. The next prime is 23421001. The reversal of 23420997 is 79902432.

It can be written as a sum of positive squares in only one way, i.e., 21818241 + 1602756 = 4671^2 + 1266^2 .

It is not a de Polignac number, because 23420997 - 2⁶ = 23420933 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 (23427997) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1301158 + ... + 1301175.

Almost surely, 2^23420997 is an apocalyptic number.

It is an amenable number.

23420997 is a deficient number, since it is larger than the sum of its proper divisors (10409345).

23420997 is a wasteful number, since it uses less digits than its factorization.

23420997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2602339 (or 2602336 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 23420997 is about 4839.5244601097. The cubic root of 23420997 is about 286.1113760878. Note that the first 3 decimals are identical.

The spelling of 23420997 in words is "twenty-three million, four hundred twenty thousand, nine hundred ninety-seven".