20464172 has 6 divisors (see below), whose sum is σ = 35812308. Its totient is φ = 10232084.

The previous prime is 20464153. The next prime is 20464177. The reversal of 20464172 is 27146402.

It is not an unprimeable number, because it can be changed into a prime (20464177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2558018 + ... + 2558025.

It is an arithmetic number, because the mean of its divisors is an integer number (5968718).

Almost surely, 2^20464172 is an apocalyptic number.

It is an amenable number.

20464172 is a deficient number, since it is larger than the sum of its proper divisors (15348136).

20464172 is a wasteful number, since it uses less digits than its factorization.

20464172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5116047 (or 5116045 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 20464172 is about 4523.7342981214. The cubic root of 20464172 is about 273.5256502318.

The spelling of 20464172 in words is "twenty million, four hundred sixty-four thousand, one hundred seventy-two".