20507313 has 8 divisors (see below), whose sum is σ = 27407968. Its totient is φ = 13639104.

The previous prime is 20507281. The next prime is 20507323. The reversal of 20507313 is 31370502.

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 20507313 - 2⁵ = 20507281 is a prime.

It is the 4529-th Hogben number.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20507313.

It is not an unprimeable number, because it can be changed into a prime (20507323) by changing a digit.

It is a nontrivial repunit in base 4528.

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, 6595 + ... + 9192.

It is an arithmetic number, because the mean of its divisors is an integer number (3425996).

Almost surely, 2^20507313 is an apocalyptic number.

It is an amenable number.

20507313 is a deficient number, since it is larger than the sum of its proper divisors (6900655).

20507313 is a wasteful number, since it uses less digits than its factorization.

20507313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16223.

The product of its (nonzero) digits is 630, while the sum is 21.

The square root of 20507313 is about 4528.5000828089. The cubic root of 20507313 is about 273.7177239318.

Adding to 20507313 its reverse (31370502), we get a palindrome (51877815).

The spelling of 20507313 in words is "twenty million, five hundred seven thousand, three hundred thirteen".