23173220 has 24 divisors (see below), whose sum is σ = 55616064. Its totient is φ = 7945056.

The previous prime is 23173181. The next prime is 23173231. The reversal of 23173220 is 2237132.

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 = 23173192 and 23173201.

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, 82622 + ... + 82901.

It is an arithmetic number, because the mean of its divisors is an integer number (2317336).

Almost surely, 2^23173220 is an apocalyptic number.

23173220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23173220 is an abundant number, since it is smaller than the sum of its proper divisors (32442844).

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

23173220 is a wasteful number, since it uses less digits than its factorization.

23173220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165539 (or 165537 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 23173220 is about 4813.8570813849. The cubic root of 23173220 is about 285.0988474197.

The spelling of 23173220 in words is "twenty-three million, one hundred seventy-three thousand, two hundred twenty".