20311272 has 24 divisors (see below), whose sum is σ = 55009890. Its totient is φ = 6770400.

The previous prime is 20311211. The next prime is 20311273. The reversal of 20311272 is 27211302.

It can be written as a sum of positive squares in only one way, i.e., 19131876 + 1179396 = 4374^2 + 1086^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20311273) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 140979 + ... + 141122.

Almost surely, 2^20311272 is an apocalyptic number.

It is an amenable number.

20311272 is an abundant number, since it is smaller than the sum of its proper divisors (34698618).

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

20311272 is a wasteful number, since it uses less digits than its factorization.

20311272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282113 (or 282106 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 20311272 is about 4506.8028579027. The cubic root of 20311272 is about 272.8427222731.

Adding to 20311272 its reverse (27211302), we get a palindrome (47522574).

The spelling of 20311272 in words is "twenty million, three hundred eleven thousand, two hundred seventy-two".