19825988 has 72 divisors (see below), whose sum is σ = 45045504. Its totient is φ = 7560000.

The previous prime is 19825979. The next prime is 19826033. The reversal of 19825988 is 88952891.

It is a super-2 number, since 2×19825988² = 786139600352288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78863 + ... + 79113.

It is an arithmetic number, because the mean of its divisors is an integer number (625632).

Almost surely, 2^19825988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19825988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22522752).

19825988 is an abundant number, since it is smaller than the sum of its proper divisors (25219516).

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

19825988 is a wasteful number, since it uses less digits than its factorization.

19825988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 304 counting only the distinct ones).

The product of its digits is 414720, while the sum is 50.

The square root of 19825988 is about 4452.6383190194. The cubic root of 19825988 is about 270.6522320219.

The spelling of 19825988 in words is "nineteen million, eight hundred twenty-five thousand, nine hundred eighty-eight".