220172225 has 24 divisors (see below), whose sum is σ = 336020160. Its totient is φ = 139360320.

The previous prime is 220172221. The next prime is 220172269. The reversal of 220172225 is 522271022.

It is not a de Polignac number, because 220172225 - 2² = 220172221 is a prime.

It is a super-2 number, since 2×220172225² = 96951617322901250, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 220172225.

It is not an unprimeable number, because it can be changed into a prime (220172221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46115 + ... + 50664.

It is an arithmetic number, because the mean of its divisors is an integer number (14000840).

Almost surely, 2^220172225 is an apocalyptic number.

220172225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

220172225 is a deficient number, since it is larger than the sum of its proper divisors (115847935).

220172225 is a wasteful number, since it uses less digits than its factorization.

220172225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96809 (or 96804 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 220172225 is about 14838.2015419659. The cubic root of 220172225 is about 603.8385613378.

It can be divided in two parts, 22017 and 2225, that added together give a palindrome (24242).

The spelling of 220172225 in words is "two hundred twenty million, one hundred seventy-two thousand, two hundred twenty-five".