23155220 has 24 divisors (see below), whose sum is σ = 53047008. Its totient is φ = 8420000.

The previous prime is 23155217. The next prime is 23155247. The reversal of 23155220 is 2255132.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 23155192 and 23155201.

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, 52406 + ... + 52845.

It is an arithmetic number, because the mean of its divisors is an integer number (2210292).

Almost surely, 2^23155220 is an apocalyptic number.

23155220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23155220 is an abundant number, since it is smaller than the sum of its proper divisors (29891788).

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

23155220 is a wasteful number, since it uses less digits than its factorization.

23155220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105271 (or 105269 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 23155220 is about 4811.9871155272. The cubic root of 23155220 is about 285.0250106295.

The spelling of 23155220 in words is "twenty-three million, one hundred fifty-five thousand, two hundred twenty".