20311332 has 24 divisors (see below), whose sum is σ = 48402816. Its totient is φ = 6626208.

The previous prime is 20311331. The next prime is 20311337. The reversal of 20311332 is 23311302.

It is a super-2 number, since 2×20311332² = 825100415228448, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20311331) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 17443 + ... + 18570.

It is an arithmetic number, because the mean of its divisors is an integer number (2016784).

Almost surely, 2^20311332 is an apocalyptic number.

It is an amenable number.

20311332 is an abundant number, since it is smaller than the sum of its proper divisors (28091484).

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

20311332 is a wasteful number, since it uses less digits than its factorization.

20311332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36067 (or 36065 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 20311332 is about 4506.8095145014. The cubic root of 20311332 is about 272.8429909342.

Adding to 20311332 its reverse (23311302), we get a palindrome (43622634).

The spelling of 20311332 in words is "twenty million, three hundred eleven thousand, three hundred thirty-two".