20113172 has 24 divisors (see below), whose sum is σ = 38250240. Its totient is φ = 9218880.

The previous prime is 20113169. The next prime is 20113187. The reversal of 20113172 is 27131102.

It is a self number, because there is not a number n which added to its sum of digits gives 20113172.

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, 1913 + ... + 6624.

It is an arithmetic number, because the mean of its divisors is an integer number (1593760).

Almost surely, 2^20113172 is an apocalyptic number.

It is an amenable number.

20113172 is a deficient number, since it is larger than the sum of its proper divisors (18137068).

20113172 is a wasteful number, since it uses less digits than its factorization.

20113172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8591 (or 8589 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 20113172 is about 4484.7711201353. The cubic root of 20113172 is about 271.9527924128.

Adding to 20113172 its reverse (27131102), we get a palindrome (47244274).

The spelling of 20113172 in words is "twenty million, one hundred thirteen thousand, one hundred seventy-two".