209100420 has 96 divisors (see below), whose sum is σ = 655872000. Its totient is φ = 55302912.

The previous prime is 209100379. The next prime is 209100457. The reversal of 209100420 is 24001902.

209100420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 209100393 and 209100402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67056 + ... + 70104.

It is an arithmetic number, because the mean of its divisors is an integer number (6832000).

Almost surely, 2^209100420 is an apocalyptic number.

209100420 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 209100420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327936000).

209100420 is an abundant number, since it is smaller than the sum of its proper divisors (446771580).

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

209100420 is a wasteful number, since it uses less digits than its factorization.

209100420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3194 (or 3186 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 209100420 is about 14460.3049760370. The cubic root of 209100420 is about 593.5422450244.

The spelling of 209100420 in words is "two hundred nine million, one hundred thousand, four hundred twenty".