20313321 has 16 divisors (see below), whose sum is σ = 31180800. Its totient is φ = 11522448.

The previous prime is 20313281. The next prime is 20313343. The reversal of 20313321 is 12331302.

It is not a de Polignac number, because 20313321 - 2¹¹ = 20311273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20313321.

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 15 ways as a sum of consecutive naturals, for example, 561 + ... + 6398.

It is an arithmetic number, because the mean of its divisors is an integer number (1948800).

Almost surely, 2^20313321 is an apocalyptic number.

20313321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20313321 is a deficient number, since it is larger than the sum of its proper divisors (10867479).

20313321 is a wasteful number, since it uses less digits than its factorization.

20313321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7108.

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

The square root of 20313321 is about 4507.0301751819. The cubic root of 20313321 is about 272.8518967509.

Adding to 20313321 its reverse (12331302), we get a palindrome (32644623).

The spelling of 20313321 in words is "twenty million, three hundred thirteen thousand, three hundred twenty-one".