20311781658330 has 32 divisors (see below), whose sum is σ = 49881956819904. Its totient is φ = 5290510571136.

The previous prime is 20311781658323. The next prime is 20311781658391. The reversal of 20311781658330 is 3385618711302.

It is a self number, because there is not a number n which added to its sum of digits gives 20311781658330.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7872782299 + ... + 7872784878.

It is an arithmetic number, because the mean of its divisors is an integer number (1558811150622).

Almost surely, 2^{20311781658330} is an apocalyptic number.

20311781658330 is an abundant number, since it is smaller than the sum of its proper divisors (29570175161574).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20311781658330 is a wasteful number, since it uses less digits than its factorization.

20311781658330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15745567230.

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 20311781658330 in words is "twenty trillion, three hundred eleven billion, seven hundred eighty-one million, six hundred fifty-eight thousand, three hundred thirty".