23920989 has 16 divisors (see below), whose sum is σ = 35240832. Its totient is φ = 14355968.

The previous prime is 23920973. The next prime is 23921011. The reversal of 23920989 is 98902932.

It is a cyclic number.

It is not a de Polignac number, because 23920989 - 2⁴ = 23920973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23920989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23920909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9024 + ... + 11369.

It is an arithmetic number, because the mean of its divisors is an integer number (2202552).

Almost surely, 2^23920989 is an apocalyptic number.

It is an amenable number.

23920989 is a deficient number, since it is larger than the sum of its proper divisors (11319843).

23920989 is a wasteful number, since it uses less digits than its factorization.

23920989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20436.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 23920989 is about 4890.9088112538. The cubic root of 23920989 is about 288.1330283397.

The spelling of 23920989 in words is "twenty-three million, nine hundred twenty thousand, nine hundred eighty-nine".