20318077793 has 16 divisors (see below), whose sum is σ = 22421952336. Its totient is φ = 18291778560.

The previous prime is 20318077789. The next prime is 20318077837. The reversal of 20318077793 is 39777081302.

It can be written as a sum of positive squares in 8 ways, for example, as 122257249 + 20195820544 = 11057^2 + 142112^2 .

It is a cyclic number.

It is not a de Polignac number, because 20318077793 - 2² = 20318077789 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20318077733) 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, 3233771 + ... + 3240047.

It is an arithmetic number, because the mean of its divisors is an integer number (1401372021).

Almost surely, 2^20318077793 is an apocalyptic number.

It is an amenable number.

20318077793 is a deficient number, since it is larger than the sum of its proper divisors (2103874543).

20318077793 is a wasteful number, since it uses less digits than its factorization.

20318077793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12404.

The product of its (nonzero) digits is 444528, while the sum is 47.

The spelling of 20318077793 in words is "twenty billion, three hundred eighteen million, seventy-seven thousand, seven hundred ninety-three".