20172152 has 96 divisors (see below), whose sum is σ = 51391200. Its totient is φ = 7223040.

The previous prime is 20172137. The next prime is 20172157. The reversal of 20172152 is 25127102.

It is a super-2 number, since 2×20172152² = 813831432622208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20172157) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87974 + ... + 88202.

It is an arithmetic number, because the mean of its divisors is an integer number (535325).

Almost surely, 2^20172152 is an apocalyptic number.

20172152 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20172152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25695600).

20172152 is an abundant number, since it is smaller than the sum of its proper divisors (31219048).

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

20172152 is a wasteful number, since it uses less digits than its factorization.

20172152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277 (or 262 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 20172152 is about 4491.3418930204. The cubic root of 20172152 is about 272.2183583946.

Adding to 20172152 its reverse (25127102), we get a palindrome (45299254).

The spelling of 20172152 in words is "twenty million, one hundred seventy-two thousand, one hundred fifty-two".