20940313 has 8 divisors (see below), whose sum is σ = 21201768. Its totient is φ = 20680704.

The previous prime is 20940289. The next prime is 20940329. The reversal of 20940313 is 31304902.

It can be written as a sum of positive squares in 4 ways, for example, as 582169 + 20358144 = 763^2 + 4512^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20940313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20940343) 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, 48145 + ... + 48577.

It is an arithmetic number, because the mean of its divisors is an integer number (2650221).

Almost surely, 2^20940313 is an apocalyptic number.

It is an amenable number.

20940313 is a deficient number, since it is larger than the sum of its proper divisors (261455).

20940313 is a wasteful number, since it uses less digits than its factorization.

20940313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 20940313 is about 4576.0586753231. The cubic root of 20940313 is about 275.6307856280.

The spelling of 20940313 in words is "twenty million, nine hundred forty thousand, three hundred thirteen".