23921220 has 48 divisors (see below), whose sum is σ = 67209408. Its totient is φ = 6357120.

The previous prime is 23921213. The next prime is 23921221. The reversal of 23921220 is 2212932.

It is not an unprimeable number, because it can be changed into a prime (23921221) 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, 24787 + ... + 25733.

It is an arithmetic number, because the mean of its divisors is an integer number (1400196).

Almost surely, 2^23921220 is an apocalyptic number.

23921220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23921220 is an abundant number, since it is smaller than the sum of its proper divisors (43288188).

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

23921220 is a wasteful number, since it uses less digits than its factorization.

23921220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380 (or 1378 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 23921220 is about 4890.9324264398. The cubic root of 23921220 is about 288.1339558169.

The spelling of 23921220 in words is "twenty-three million, nine hundred twenty-one thousand, two hundred twenty".