16638020 has 24 divisors (see below), whose sum is σ = 39931584. Its totient is φ = 5704416.

The previous prime is 16638001. The next prime is 16638023. The reversal of 16638020 is 2083661.

16638020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (16638023) 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, 59282 + ... + 59561.

It is an arithmetic number, because the mean of its divisors is an integer number (1663816).

Almost surely, 2^16638020 is an apocalyptic number.

16638020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16638020 is an abundant number, since it is smaller than the sum of its proper divisors (23293564).

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

16638020 is a wasteful number, since it uses less digits than its factorization.

16638020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118859 (or 118857 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 16638020 is about 4078.9729099370. The cubic root of 16638020 is about 255.2900454642.

The spelling of 16638020 in words is "sixteen million, six hundred thirty-eight thousand, twenty".