20400694313 has 8 divisors (see below), whose sum is σ = 20451621960. Its totient is φ = 20349796480.

The previous prime is 20400694309. The next prime is 20400694319. The reversal of 20400694313 is 31349600402.

It can be written as a sum of positive squares in 4 ways, for example, as 28270489 + 20372423824 = 5317^2 + 142732^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20400694313 - 2² = 20400694309 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20400694313.

It is not an unprimeable number, because it can be changed into a prime (20400694319) 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, 2027531 + ... + 2037567.

It is an arithmetic number, because the mean of its divisors is an integer number (2556452745).

Almost surely, 2^20400694313 is an apocalyptic number.

It is an amenable number.

20400694313 is a deficient number, since it is larger than the sum of its proper divisors (50927647).

20400694313 is a wasteful number, since it uses less digits than its factorization.

20400694313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14907.

The product of its (nonzero) digits is 15552, while the sum is 32.

The spelling of 20400694313 in words is "twenty billion, four hundred million, six hundred ninety-four thousand, three hundred thirteen".