16891020 has 72 divisors (see below), whose sum is σ = 51773904. Its totient is φ = 4457088.

The previous prime is 16891003. The next prime is 16891031. The reversal of 16891020 is 2019861.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18822 + ... + 19698.

It is an arithmetic number, because the mean of its divisors is an integer number (719082).

Almost surely, 2^16891020 is an apocalyptic number.

16891020 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 16891020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25886952).

16891020 is an abundant number, since it is smaller than the sum of its proper divisors (34882884).

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

16891020 is a wasteful number, since it uses less digits than its factorization.

16891020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999 (or 994 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 16891020 is about 4109.8686110386. The cubic root of 16891020 is about 256.5775331885.

The spelling of 16891020 in words is "sixteen million, eight hundred ninety-one thousand, twenty".