20199520813 has 8 divisors (see below), whose sum is σ = 20237490936. Its totient is φ = 20161574400.

The previous prime is 20199520807. The next prime is 20199520841. The reversal of 20199520813 is 31802599102.

It can be written as a sum of positive squares in 4 ways, for example, as 3048475369 + 17151045444 = 55213^2 + 130962^2 .

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-20199520813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20199520613) 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, 3117345 + ... + 3123817.

It is an arithmetic number, because the mean of its divisors is an integer number (2529686367).

Almost surely, 2^20199520813 is an apocalyptic number.

It is an amenable number.

20199520813 is a deficient number, since it is larger than the sum of its proper divisors (37970123).

20199520813 is an equidigital number, since it uses as much as digits as its factorization.

20199520813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11855.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 20199520813 in words is "twenty billion, one hundred ninety-nine million, five hundred twenty thousand, eight hundred thirteen".