20939100 has 216 divisors, whose sum is σ = 76245120. Its totient is φ = 4343040.

The previous prime is 20939071. The next prime is 20939123. The reversal of 20939100 is 193902.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 354871 + ... + 354929.

Almost surely, 2^20939100 is an apocalyptic number.

20939100 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 20939100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38122560).

20939100 is an abundant number, since it is smaller than the sum of its proper divisors (55306020).

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

20939100 is a wasteful number, since it uses less digits than its factorization.

20939100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 20939100 is about 4575.9261357675. The cubic root of 20939100 is about 275.6254634121.

The spelling of 20939100 in words is "twenty million, nine hundred thirty-nine thousand, one hundred".