20889172 has 12 divisors (see below), whose sum is σ = 37447956. Its totient is φ = 10189760.

The previous prime is 20889163. The next prime is 20889173. The reversal of 20889172 is 27198802.

It can be written as a sum of positive squares in 2 ways, for example, as 2604996 + 18284176 = 1614^2 + 4276^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20889173) 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, 63523 + ... + 63850.

It is an arithmetic number, because the mean of its divisors is an integer number (3120663).

Almost surely, 2^20889172 is an apocalyptic number.

It is an amenable number.

20889172 is a deficient number, since it is larger than the sum of its proper divisors (16558784).

20889172 is a wasteful number, since it uses less digits than its factorization.

20889172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127418 (or 127416 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 20889172 is about 4570.4673721623. The cubic root of 20889172 is about 275.4062183887.

The spelling of 20889172 in words is "twenty million, eight hundred eighty-nine thousand, one hundred seventy-two".