19219920 has 80 divisors (see below), whose sum is σ = 60746112. Its totient is φ = 5025280.

The previous prime is 19219919. The next prime is 19219931. The reversal of 19219920 is 2991291.

It is a tau number, because it is divible by the number of its divisors (80).

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, 11965 + ... + 13475.

Almost surely, 2^19219920 is an apocalyptic number.

19219920 is a gapful number since it is divisible by the number (10) 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 19219920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30373056).

19219920 is an abundant number, since it is smaller than the sum of its proper divisors (41526192).

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

19219920 is a wasteful number, since it uses less digits than its factorization.

19219920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580 (or 1574 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 19219920 is about 4384.0529193886. The cubic root of 19219920 is about 267.8657529169.

The spelling of 19219920 in words is "nineteen million, two hundred nineteen thousand, nine hundred twenty".