20810172 has 24 divisors (see below), whose sum is σ = 48706000. Its totient is φ = 6915456.

The previous prime is 20810129. The next prime is 20810177. The reversal of 20810172 is 27101802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20810177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1704 + ... + 6672.

Almost surely, 2^20810172 is an apocalyptic number.

It is an amenable number.

20810172 is an abundant number, since it is smaller than the sum of its proper divisors (27895828).

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

20810172 is a wasteful number, since it uses less digits than its factorization.

20810172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5325 (or 5323 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 20810172 is about 4561.8167433600. The cubic root of 20810172 is about 275.0585968797.

Adding to 20810172 its reverse (27101802), we get a palindrome (47911974).

The spelling of 20810172 in words is "twenty million, eight hundred ten thousand, one hundred seventy-two".