20619872 has 96 divisors (see below), whose sum is σ = 51170112. Its totient is φ = 7962624.

The previous prime is 20619839. The next prime is 20619889. The reversal of 20619872 is 27891602.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212528 + ... + 212624.

It is an arithmetic number, because the mean of its divisors is an integer number (533022).

Almost surely, 2^20619872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20619872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25585056).

20619872 is an abundant number, since it is smaller than the sum of its proper divisors (30550240).

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

20619872 is a wasteful number, since it uses less digits than its factorization.

20619872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 20619872 is about 4540.9109218306. The cubic root of 20619872 is about 274.2175975858.

The spelling of 20619872 in words is "twenty million, six hundred nineteen thousand, eight hundred seventy-two".