20313331 has 4 divisors (see below), whose sum is σ = 20390832. Its totient is φ = 20235832.

The previous prime is 20313281. The next prime is 20313343. The reversal of 20313331 is 13331302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20313331 - 2⁷ = 20313203 is a prime.

It is a super-2 number, since 2×20313331² = 825262832631122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20313361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38356 + ... + 38881.

It is an arithmetic number, because the mean of its divisors is an integer number (5097708).

Almost surely, 2^20313331 is an apocalyptic number.

20313331 is a deficient number, since it is larger than the sum of its proper divisors (77501).

20313331 is an equidigital number, since it uses as much as digits as its factorization.

20313331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77500.

The product of its (nonzero) digits is 162, while the sum is 16.

The square root of 20313331 is about 4507.0312845597. The cubic root of 20313331 is about 272.8519415247.

Adding to 20313331 its reverse (13331302), we get a palindrome (33644633).

The spelling of 20313331 in words is "twenty million, three hundred thirteen thousand, three hundred thirty-one".