16699720 has 16 divisors (see below), whose sum is σ = 37574460. Its totient is φ = 6679872.

The previous prime is 16699687. The next prime is 16699721. The reversal of 16699720 is 2799661.

It can be written as a sum of positive squares in 2 ways, for example, as 15984004 + 715716 = 3998^2 + 846^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 417493 = 16699720 / (1 + 6 + 6 + 9 + 9 + 7 + 2 + 0).

It is not an unprimeable number, because it can be changed into a prime (16699721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208707 + ... + 208786.

Almost surely, 2^16699720 is an apocalyptic number.

16699720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16699720 is an abundant number, since it is smaller than the sum of its proper divisors (20874740).

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

16699720 is a wasteful number, since it uses less digits than its factorization.

16699720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417504 (or 417500 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 16699720 is about 4086.5290895820. The cubic root of 16699720 is about 255.6052265000.

The spelling of 16699720 in words is "sixteen million, six hundred ninety-nine thousand, seven hundred twenty".