16999620 has 96 divisors (see below), whose sum is σ = 53222400. Its totient is φ = 4018560.

The previous prime is 16999603. The next prime is 16999621. The reversal of 16999620 is 2699961.

It is a happy number.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (16999621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28081 + ... + 28679.

It is an arithmetic number, because the mean of its divisors is an integer number (554400).

Almost surely, 2^16999620 is an apocalyptic number.

16999620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16999620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26611200).

16999620 is an abundant number, since it is smaller than the sum of its proper divisors (36222780).

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

16999620 is a wasteful number, since it uses less digits than its factorization.

16999620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665 (or 663 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 16999620 is about 4123.0595435914. The cubic root of 16999620 is about 257.1262431947.

The spelling of 16999620 in words is "sixteen million, nine hundred ninety-nine thousand, six hundred twenty".