20951313 has 8 divisors (see below), whose sum is σ = 28408800. Its totient is φ = 13730688.

The previous prime is 20951309. The next prime is 20951323. The reversal of 20951313 is 31315902.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20951313 - 2² = 20951309 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20951303) 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, 59008 + ... + 59361.

It is an arithmetic number, because the mean of its divisors is an integer number (3551100).

Almost surely, 2^20951313 is an apocalyptic number.

It is an amenable number.

20951313 is a deficient number, since it is larger than the sum of its proper divisors (7457487).

20951313 is a wasteful number, since it uses less digits than its factorization.

20951313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118431.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 20951313 is about 4577.2604251888. The cubic root of 20951313 is about 275.6790403652.

The spelling of 20951313 in words is "twenty million, nine hundred fifty-one thousand, three hundred thirteen".