20171272 has 32 divisors (see below), whose sum is σ = 42145920. Its totient is φ = 8971840.

The previous prime is 20171233. The next prime is 20171279. The reversal of 20171272 is 27217102.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (20171279) 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, 1698 + ... + 6574.

It is an arithmetic number, because the mean of its divisors is an integer number (1317060).

Almost surely, 2^20171272 is an apocalyptic number.

20171272 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 20171272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21072960).

20171272 is an abundant number, since it is smaller than the sum of its proper divisors (21974648).

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

20171272 is a wasteful number, since it uses less digits than its factorization.

20171272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4941 (or 4937 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 20171272 is about 4491.2439256847. The cubic root of 20171272 is about 272.2143998740.

Adding to 20171272 its reverse (27217102), we get a palindrome (47388374).

The spelling of 20171272 in words is "twenty million, one hundred seventy-one thousand, two hundred seventy-two".