19109086920 has 512 divisors, whose sum is σ = 80737689600. Its totient is φ = 3904588800.

The previous prime is 19109086891. The next prime is 19109086921. The reversal of 19109086920 is 2968090191.

It is a super-2 number, since 2×19109086920² (a number of 21 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (19109086921) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5070877 + ... + 5074643.

It is an arithmetic number, because the mean of its divisors is an integer number (157690800).

Almost surely, 2^19109086920 is an apocalyptic number.

19109086920 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 19109086920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40368844800).

19109086920 is an abundant number, since it is smaller than the sum of its proper divisors (61628602680).

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

19109086920 is a wasteful number, since it uses less digits than its factorization.

19109086920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3866 (or 3856 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The spelling of 19109086920 in words is "nineteen billion, one hundred nine million, eighty-six thousand, nine hundred twenty".