20711172 has 12 divisors (see below), whose sum is σ = 48326096. Its totient is φ = 6903720.

The previous prime is 20711167. The next prime is 20711177. The reversal of 20711172 is 27111702.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20711167) and next prime (20711177).

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

It is a super-2 number, since 2×20711172² = 857905291227168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20711177) 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, 862954 + ... + 862977.

Almost surely, 2^20711172 is an apocalyptic number.

It is an amenable number.

20711172 is an abundant number, since it is smaller than the sum of its proper divisors (27614924).

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

20711172 is a wasteful number, since it uses less digits than its factorization.

20711172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725938 (or 1725936 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 21.

The square root of 20711172 is about 4550.9528672576. The cubic root of 20711172 is about 274.6217256359.

Adding to 20711172 its reverse (27111702), we get a palindrome (47822874).

The spelling of 20711172 in words is "twenty million, seven hundred eleven thousand, one hundred seventy-two".