16720194831 has 8 divisors (see below), whose sum is σ = 22296032304. Its totient is φ = 11145576960.

The previous prime is 16720194797. The next prime is 16720194833. The reversal of 16720194831 is 13849102761.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-16720194831 is a prime.

It is a super-2 number, since 2×16720194831² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16720194833) 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, 272416 + ... + 328101.

It is an arithmetic number, because the mean of its divisors is an integer number (2787004038).

Almost surely, 2^16720194831 is an apocalyptic number.

16720194831 is a deficient number, since it is larger than the sum of its proper divisors (5575837473).

16720194831 is an equidigital number, since it uses as much as digits as its factorization.

16720194831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609801.

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 16720194831 in words is "sixteen billion, seven hundred twenty million, one hundred ninety-four thousand, eight hundred thirty-one".