20220172 has 12 divisors (see below), whose sum is σ = 40440400. Its totient is φ = 8665776.

The previous prime is 20220149. The next prime is 20220173. The reversal of 20220172 is 27102202.

20220172 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20220173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361047 + ... + 361102.

Almost surely, 2^20220172 is an apocalyptic number.

It is an amenable number.

20220172 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20220172 is a wasteful number, since it uses less digits than its factorization.

20220172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722160 (or 722158 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 20220172 is about 4496.6845564260. The cubic root of 20220172 is about 272.4341933511.

Adding to 20220172 its reverse (27102202), we get a palindrome (47322374).

The spelling of 20220172 in words is "twenty million, two hundred twenty thousand, one hundred seventy-two".