19919370240 has 864 divisors, whose sum is σ = 87827528880. Its totient is φ = 4128768000.

The previous prime is 19919370239. The next prime is 19919370241. The reversal of 19919370240 is 4207391991.

It is an interprime number because it is at equal distance from previous prime (19919370239) and next prime (19919370241).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19919370241) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 49674040 + ... + 49674440.

Almost surely, 2^19919370240 is an apocalyptic number.

19919370240 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 19919370240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43913764440).

19919370240 is an abundant number, since it is smaller than the sum of its proper divisors (67908158640).

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

19919370240 is a wasteful number, since it uses less digits than its factorization.

19919370240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459 (or 429 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The spelling of 19919370240 in words is "nineteen billion, nine hundred nineteen million, three hundred seventy thousand, two hundred forty".