20313138 has 16 divisors (see below), whose sum is σ = 40677120. Its totient is φ = 6762576.

The previous prime is 20313133. The next prime is 20313143. The reversal of 20313138 is 83131302.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20313133) and next prime (20313143).

It is not an unprimeable number, because it can be changed into a prime (20313133) 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, 4831 + ... + 7997.

It is an arithmetic number, because the mean of its divisors is an integer number (2542320).

Almost surely, 2^20313138 is an apocalyptic number.

20313138 is an abundant number, since it is smaller than the sum of its proper divisors (20363982).

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

20313138 is a wasteful number, since it uses less digits than its factorization.

20313138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4241.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 20313138 is about 4507.0098735192. The cubic root of 20313138 is about 272.8510773863.

The spelling of 20313138 in words is "twenty million, three hundred thirteen thousand, one hundred thirty-eight".