19965228 has 24 divisors (see below), whose sum is σ = 46733232. Its totient is φ = 6633984.

The previous prime is 19965223. The next prime is 19965229. The reversal of 19965228 is 82256991.

It is a super-2 number, since 2×19965228² = 797220658183968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19965228.

It is not an unprimeable number, because it can be changed into a prime (19965223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1576 + ... + 6512.

It is an arithmetic number, because the mean of its divisors is an integer number (1947218).

Almost surely, 2^19965228 is an apocalyptic number.

It is an amenable number.

19965228 is an abundant number, since it is smaller than the sum of its proper divisors (26768004).

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

19965228 is a wasteful number, since it uses less digits than its factorization.

19965228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5281 (or 5279 counting only the distinct ones).

The product of its digits is 77760, while the sum is 42.

The square root of 19965228 is about 4468.2466359860. The cubic root of 19965228 is about 271.2843608563.

The spelling of 19965228 in words is "nineteen million, nine hundred sixty-five thousand, two hundred twenty-eight".