16481820 has 24 divisors (see below), whose sum is σ = 46149264. Its totient is φ = 4395136.

The previous prime is 16481809. The next prime is 16481851. The reversal of 16481820 is 2818461.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137289 + ... + 137408.

It is an arithmetic number, because the mean of its divisors is an integer number (1922886).

Almost surely, 2^16481820 is an apocalyptic number.

16481820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16481820 is an abundant number, since it is smaller than the sum of its proper divisors (29667444).

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

16481820 is a wasteful number, since it uses less digits than its factorization.

16481820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274709 (or 274707 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 16481820 is about 4059.7807822591. The cubic root of 16481820 is about 254.4886330342.

The spelling of 16481820 in words is "sixteen million, four hundred eighty-one thousand, eight hundred twenty".