19201220 has 48 divisors (see below), whose sum is σ = 41912640. Its totient is φ = 7383936.

The previous prime is 19201213. The next prime is 19201253. The reversal of 19201220 is 2210291.

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, 71246 + ... + 71514.

It is an arithmetic number, because the mean of its divisors is an integer number (873180).

Almost surely, 2^19201220 is an apocalyptic number.

19201220 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 19201220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20956320).

19201220 is an abundant number, since it is smaller than the sum of its proper divisors (22711420).

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

19201220 is a wasteful number, since it uses less digits than its factorization.

19201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404 (or 402 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 19201220 is about 4381.9196706466. The cubic root of 19201220 is about 267.7788514975.

The spelling of 19201220 in words is "nineteen million, two hundred one thousand, two hundred twenty".