20313261 has 40 divisors (see below), whose sum is σ = 32582880. Its totient is φ = 12573792.

The previous prime is 20313247. The next prime is 20313281. The reversal of 20313261 is 16231302.

It is not a de Polignac number, because 20313261 - 2⁵ = 20313229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20313281) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 103015 + ... + 103211.

It is an arithmetic number, because the mean of its divisors is an integer number (814572).

Almost surely, 2^20313261 is an apocalyptic number.

It is an amenable number.

20313261 is a deficient number, since it is larger than the sum of its proper divisors (12269619).

20313261 is a wasteful number, since it uses less digits than its factorization.

20313261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295 (or 286 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 20313261 is about 4507.0235189091. The cubic root of 20313261 is about 272.8516281073.

Adding to 20313261 its reverse (16231302), we get a palindrome (36544563).

The spelling of 20313261 in words is "twenty million, three hundred thirteen thousand, two hundred sixty-one".