19999481040 has 320 divisors, whose sum is σ = 85885931520. Its totient is φ = 4155701760.

The previous prime is 19999481023. The next prime is 19999481041. The reversal of 19999481040 is 4018499991.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19999481041) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 106197 + ... + 226443.

It is an arithmetic number, because the mean of its divisors is an integer number (268393536).

Almost surely, 2^19999481040 is an apocalyptic number.

19999481040 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 19999481040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42942965760).

19999481040 is an abundant number, since it is smaller than the sum of its proper divisors (65886450480).

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

19999481040 is a wasteful number, since it uses less digits than its factorization.

19999481040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120287 (or 120275 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 54.

The spelling of 19999481040 in words is "nineteen billion, nine hundred ninety-nine million, four hundred eighty-one thousand, forty".