19965528 has 80 divisors (see below), whose sum is σ = 61027560. Its totient is φ = 6048000.

The previous prime is 19965521. The next prime is 19965551. The reversal of 19965528 is 82556991.

19965528 is a `hidden beast` number, since 1 + 9 + 96 + 552 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19965521) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5728 + ... + 8528.

Almost surely, 2^19965528 is an apocalyptic number.

19965528 is a gapful number since it is divisible by the number (18) 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 19965528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30513780).

19965528 is an abundant number, since it is smaller than the sum of its proper divisors (41062032).

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

19965528 is a wasteful number, since it uses less digits than its factorization.

19965528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830 (or 2817 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The square root of 19965528 is about 4468.2802060748. The cubic root of 19965528 is about 271.2857196336.

The spelling of 19965528 in words is "nineteen million, nine hundred sixty-five thousand, five hundred twenty-eight".