23320557 has 12 divisors (see below), whose sum is σ = 36276604. Its totient is φ = 14351040.

The previous prime is 23320547. The next prime is 23320567. The reversal of 23320557 is 75502332.

It is an interprime number because it is at equal distance from previous prime (23320547) and next prime (23320567).

It can be written as a sum of positive squares in 2 ways, for example, as 14356521 + 8964036 = 3789^2 + 2994^2 .

It is not a de Polignac number, because 23320557 - 2¹⁶ = 23255021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23320557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23320537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99544 + ... + 99777.

Almost surely, 2^23320557 is an apocalyptic number.

It is an amenable number.

23320557 is a deficient number, since it is larger than the sum of its proper divisors (12956047).

23320557 is a wasteful number, since it uses less digits than its factorization.

23320557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199340 (or 199337 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 27.

The square root of 23320557 is about 4829.1362581729. The cubic root of 23320557 is about 285.7017976804.

Adding to 23320557 its reverse (75502332), we get a palindrome (98822889).

The spelling of 23320557 in words is "twenty-three million, three hundred twenty thousand, five hundred fifty-seven".