20215272 has 64 divisors (see below), whose sum is σ = 63014400. Its totient is φ = 5250240.

The previous prime is 20215267. The next prime is 20215301. The reversal of 20215272 is 27251202.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3622 + ... + 7317.

It is an arithmetic number, because the mean of its divisors is an integer number (984600).

Almost surely, 2^20215272 is an apocalyptic number.

20215272 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20215272 is an abundant number, since it is smaller than the sum of its proper divisors (42799128).

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

20215272 is a wasteful number, since it uses less digits than its factorization.

20215272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10966 (or 10962 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 20215272 is about 4496.1396775456. The cubic root of 20215272 is about 272.4121850419.

Adding to 20215272 its reverse (27251202), we get a palindrome (47466474).

The spelling of 20215272 in words is "twenty million, two hundred fifteen thousand, two hundred seventy-two".