20907172 has 24 divisors (see below), whose sum is σ = 42985152. Its totient is φ = 8772000.

The previous prime is 20907169. The next prime is 20907193. The reversal of 20907172 is 27170902.

It is a happy number.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20907172.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17704 + ... + 18847.

It is an arithmetic number, because the mean of its divisors is an integer number (1791048).

Almost surely, 2^20907172 is an apocalyptic number.

20907172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20907172 is an abundant number, since it is smaller than the sum of its proper divisors (22077980).

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

20907172 is a wasteful number, since it uses less digits than its factorization.

20907172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36579 (or 36577 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 20907172 is about 4572.4361121835. The cubic root of 20907172 is about 275.4853006475.

The spelling of 20907172 in words is "twenty million, nine hundred seven thousand, one hundred seventy-two".