20849172 has 12 divisors (see below), whose sum is σ = 48648096. Its totient is φ = 6949720.

The previous prime is 20849161. The next prime is 20849177. The reversal of 20849172 is 27194802.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20849177) 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, 868704 + ... + 868727.

It is an arithmetic number, because the mean of its divisors is an integer number (4054008).

Almost surely, 2^20849172 is an apocalyptic number.

It is an amenable number.

20849172 is an abundant number, since it is smaller than the sum of its proper divisors (27798924).

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

20849172 is a wasteful number, since it uses less digits than its factorization.

20849172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1737438 (or 1737436 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 20849172 is about 4566.0893552361. The cubic root of 20849172 is about 275.2303172443.

The spelling of 20849172 in words is "twenty million, eight hundred forty-nine thousand, one hundred seventy-two".