23321820 has 24 divisors (see below), whose sum is σ = 65301264. Its totient is φ = 6219136.

The previous prime is 23321819. The next prime is 23321833. The reversal of 23321820 is 2812332.

It is a super-2 number, since 2×23321820² = 1087814576224800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194289 + ... + 194408.

It is an arithmetic number, because the mean of its divisors is an integer number (2720886).

Almost surely, 2^23321820 is an apocalyptic number.

23321820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23321820 is an abundant number, since it is smaller than the sum of its proper divisors (41979444).

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

23321820 is a wasteful number, since it uses less digits than its factorization.

23321820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388709 (or 388707 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 23321820 is about 4829.2670251292. The cubic root of 23321820 is about 285.7069552881.

The spelling of 23321820 in words is "twenty-three million, three hundred twenty-one thousand, eight hundred twenty".