20389100 has 36 divisors (see below), whose sum is σ = 45090864. Its totient is φ = 7999680.

The previous prime is 20389097. The next prime is 20389111. The reversal of 20389100 is 198302.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3377 + ... + 7223.

It is an arithmetic number, because the mean of its divisors is an integer number (1252524).

Almost surely, 2^20389100 is an apocalyptic number.

20389100 is a gapful number since it is divisible by the number (20) 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 20389100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22545432).

20389100 is an abundant number, since it is smaller than the sum of its proper divisors (24701764).

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

20389100 is a wasteful number, since it uses less digits than its factorization.

20389100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3914 (or 3907 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 20389100 is about 4515.4291047474. The cubic root of 20389100 is about 273.1907677447.

The spelling of 20389100 in words is "twenty million, three hundred eighty-nine thousand, one hundred".