16978920 has 256 divisors, whose sum is σ = 65318400. Its totient is φ = 3440640.

The previous prime is 16978901. The next prime is 16978931. The reversal of 16978920 is 2987961.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 414100 + ... + 414140.

It is an arithmetic number, because the mean of its divisors is an integer number (255150).

Almost surely, 2^16978920 is an apocalyptic number.

16978920 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 16978920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32659200).

16978920 is an abundant number, since it is smaller than the sum of its proper divisors (48339480).

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

16978920 is a wasteful number, since it uses less digits than its factorization.

16978920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 16978920 is about 4120.5485071772. The cubic root of 16978920 is about 257.0218354675.

The spelling of 16978920 in words is "sixteen million, nine hundred seventy-eight thousand, nine hundred twenty".