19885929984 has 120 divisors (see below), whose sum is σ = 58727426472. Its totient is φ = 6474424320.

The previous prime is 19885929961. The next prime is 19885929989. The reversal of 19885929984 is 48992958891.

It is a super-2 number, since 2×19885929984² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19885929989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147964 + ... + 248324.

Almost surely, 2^19885929984 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 19885929984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29363713236).

19885929984 is an abundant number, since it is smaller than the sum of its proper divisors (38841496488).

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

19885929984 is a wasteful number, since it uses less digits than its factorization.

19885929984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100428 (or 100409 counting only the distinct ones).

The product of its digits is 134369280, while the sum is 72.

The spelling of 19885929984 in words is "nineteen billion, eight hundred eighty-five million, nine hundred twenty-nine thousand, nine hundred eighty-four".