20321313 has 8 divisors (see below), whose sum is σ = 27606528. Its totient is φ = 13291824.

The previous prime is 20321303. The next prime is 20321339. The reversal of 20321313 is 31312302.

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

It is not a de Polignac number, because 20321313 - 2⁴ = 20321297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20321292 and 20321301.

It is not an unprimeable number, because it can be changed into a prime (20321303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63745 + ... + 64062.

It is an arithmetic number, because the mean of its divisors is an integer number (3450816).

Almost surely, 2^20321313 is an apocalyptic number.

It is an amenable number.

20321313 is a deficient number, since it is larger than the sum of its proper divisors (7285215).

20321313 is a wasteful number, since it uses less digits than its factorization.

20321313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127863.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 20321313 is about 4507.9167028684. The cubic root of 20321313 is about 272.8876753489.

Adding to 20321313 its reverse (31312302), we get a palindrome (51633615).

The spelling of 20321313 in words is "twenty million, three hundred twenty-one thousand, three hundred thirteen".