23405820 has 24 divisors (see below), whose sum is σ = 65536464. Its totient is φ = 6241536.

The previous prime is 23405801. The next prime is 23405839. The reversal of 23405820 is 2850432.

It is an interprime number because it is at equal distance from previous prime (23405801) and next prime (23405839).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 194989 + ... + 195108.

It is an arithmetic number, because the mean of its divisors is an integer number (2730686).

Almost surely, 2^23405820 is an apocalyptic number.

23405820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23405820 is an abundant number, since it is smaller than the sum of its proper divisors (42130644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23405820 is a wasteful number, since it uses less digits than its factorization.

23405820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390109 (or 390107 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 23405820 is about 4837.9561800413. The cubic root of 23405820 is about 286.0495618869.

The spelling of 23405820 in words is "twenty-three million, four hundred five thousand, eight hundred twenty".