16645920 has 48 divisors (see below), whose sum is σ = 52436160. Its totient is φ = 4438784.

The previous prime is 16645901. The next prime is 16645927. The reversal of 16645920 is 2954661.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16645927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16860 + ... + 17819.

It is an arithmetic number, because the mean of its divisors is an integer number (1092420).

Almost surely, 2^16645920 is an apocalyptic number.

16645920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16645920 is an abundant number, since it is smaller than the sum of its proper divisors (35790240).

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

16645920 is a wasteful number, since it uses less digits than its factorization.

16645920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34697 (or 34689 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 16645920 is about 4079.9411760465. The cubic root of 16645920 is about 255.3304443466.

The spelling of 16645920 in words is "sixteen million, six hundred forty-five thousand, nine hundred twenty".