20311432 has 16 divisors (see below), whose sum is σ = 38148300. Its totient is φ = 10138560.

The previous prime is 20311381. The next prime is 20311433. The reversal of 20311432 is 23411302.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20304036 + 7396 = 4506^2 + 86^2 .

It is not an unprimeable number, because it can be changed into a prime (20311433) 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 3 ways as a sum of consecutive naturals, for example, 3882 + ... + 7462.

Almost surely, 2^20311432 is an apocalyptic number.

It is an amenable number.

20311432 is a deficient number, since it is larger than the sum of its proper divisors (17836868).

20311432 is a wasteful number, since it uses less digits than its factorization.

20311432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4296 (or 4292 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20311432 is about 4506.8206088106. The cubic root of 20311432 is about 272.8434387016.

Adding to 20311432 its reverse (23411302), we get a palindrome (43722734).

The spelling of 20311432 in words is "twenty million, three hundred eleven thousand, four hundred thirty-two".