16720444431 has 6 divisors (see below), whose sum is σ = 24151753080. Its totient is φ = 11146962948.

The previous prime is 16720444427. The next prime is 16720444453. The reversal of 16720444431 is 13444402761.

16720444431 is a `hidden beast` number, since 1 + 6 + 7 + 204 + 4 + 443 + 1 = 666.

It is not a de Polignac number, because 16720444431 - 2² = 16720444427 is a prime.

It is a super-2 number, since 2×16720444431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16720444331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 928913571 + ... + 928913588.

It is an arithmetic number, because the mean of its divisors is an integer number (4025292180).

Almost surely, 2^16720444431 is an apocalyptic number.

16720444431 is a deficient number, since it is larger than the sum of its proper divisors (7431308649).

16720444431 is a wasteful number, since it uses less digits than its factorization.

16720444431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857827165 (or 1857827162 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The spelling of 16720444431 in words is "sixteen billion, seven hundred twenty million, four hundred forty-four thousand, four hundred thirty-one".