19934291520 has 672 divisors, whose sum is σ = 81546192000. Its totient is φ = 4405985280.

The previous prime is 19934291497. The next prime is 19934291557. The reversal of 19934291520 is 2519243991.

19934291520 is a `hidden beast` number, since 1 + 9 + 9 + 34 + 2 + 91 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 39948231 + ... + 39948729.

It is an arithmetic number, because the mean of its divisors is an integer number (121348500).

Almost surely, 2^19934291520 is an apocalyptic number.

19934291520 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 19934291520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40773096000).

19934291520 is an abundant number, since it is smaller than the sum of its proper divisors (61611900480).

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

19934291520 is a wasteful number, since it uses less digits than its factorization.

19934291520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The spelling of 19934291520 in words is "nineteen billion, nine hundred thirty-four million, two hundred ninety-one thousand, five hundred twenty".