19112820 has 48 divisors (see below), whose sum is σ = 54008640. Its totient is φ = 5049856.

The previous prime is 19112791. The next prime is 19112843. The reversal of 19112820 is 2821191.

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, 5371 + ... + 8189.

It is an arithmetic number, because the mean of its divisors is an integer number (1125180).

Almost surely, 2^19112820 is an apocalyptic number.

19112820 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 19112820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27004320).

19112820 is an abundant number, since it is smaller than the sum of its proper divisors (34895820).

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

19112820 is a wasteful number, since it uses less digits than its factorization.

19112820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2944 (or 2942 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 19112820 is about 4371.8211308332. The cubic root of 19112820 is about 267.3672791985.

The spelling of 19112820 in words is "nineteen million, one hundred twelve thousand, eight hundred twenty".