16720869 has 24 divisors (see below), whose sum is σ = 24880576. Its totient is φ = 9979200.

The previous prime is 16720859. The next prime is 16720871. The reversal of 16720869 is 96802761.

It is not a de Polignac number, because 16720869 - 2⁹ = 16720357 is a prime.

It is a super-2 number, since 2×16720869² = 559174920230322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16720819) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26184 + ... + 26814.

Almost surely, 2^16720869 is an apocalyptic number.

It is an amenable number.

16720869 is a deficient number, since it is larger than the sum of its proper divisors (8159707).

16720869 is a wasteful number, since it uses less digits than its factorization.

16720869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729 (or 718 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 16720869 is about 4089.1159191199. The cubic root of 16720869 is about 255.7130828896.

The spelling of 16720869 in words is "sixteen million, seven hundred twenty thousand, eight hundred sixty-nine".