19807581420 has 216 divisors, whose sum is σ = 66977033760. Its totient is φ = 4733836800.

The previous prime is 19807581401. The next prime is 19807581457. The reversal of 19807581420 is 2418570891.

19807581420 is a `hidden beast` number, since 1 + 9 + 80 + 75 + 81 + 420 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1539976 + ... + 1552784.

It is an arithmetic number, because the mean of its divisors is an integer number (310078860).

Almost surely, 2^19807581420 is an apocalyptic number.

19807581420 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 19807581420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33488516880).

19807581420 is an abundant number, since it is smaller than the sum of its proper divisors (47169452340).

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

19807581420 is a wasteful number, since it uses less digits than its factorization.

19807581420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12917 (or 12901 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 19807581420 in words is "nineteen billion, eight hundred seven million, five hundred eighty-one thousand, four hundred twenty".