19741981520 has 40 divisors (see below), whose sum is σ = 46876713984. Its totient is φ = 7728774272.

The previous prime is 19741981499. The next prime is 19741981537. The reversal of 19741981520 is 2518914791.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2621504 + ... + 2629023.

Almost surely, 2^19741981520 is an apocalyptic number.

19741981520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19741981520 is an abundant number, since it is smaller than the sum of its proper divisors (27134732464).

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

19741981520 is a wasteful number, since it uses less digits than its factorization.

19741981520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5250587 (or 5250581 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 47.

The spelling of 19741981520 in words is "nineteen billion, seven hundred forty-one million, nine hundred eighty-one thousand, five hundred twenty".