19947015380 has 48 divisors (see below), whose sum is σ = 42315424704. Its totient is φ = 7897720320.

The previous prime is 19947015373. The next prime is 19947015437. The reversal of 19947015380 is 8351074991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1827419 + ... + 1838301.

It is an arithmetic number, because the mean of its divisors is an integer number (881571348).

Almost surely, 2^19947015380 is an apocalyptic number.

19947015380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19947015380 is an abundant number, since it is smaller than the sum of its proper divisors (22368409324).

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

19947015380 is a wasteful number, since it uses less digits than its factorization.

19947015380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11816 (or 11814 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 47.

The spelling of 19947015380 in words is "nineteen billion, nine hundred forty-seven million, fifteen thousand, three hundred eighty".