19621840320 has 84 divisors (see below), whose sum is σ = 67490964840. Its totient is φ = 5232489984.

The previous prime is 19621840289. The next prime is 19621840349. The reversal of 19621840320 is 2304812691.

19621840320 is a `hidden beast` number, since 1 + 9 + 621 + 8 + 4 + 0 + 3 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3403690 + ... + 3409449.

Almost surely, 2^19621840320 is an apocalyptic number.

19621840320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19621840320 is an abundant number, since it is smaller than the sum of its proper divisors (47869124520).

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

19621840320 is a wasteful number, since it uses less digits than its factorization.

19621840320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6813162 (or 6813149 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 19621840320 in words is "nineteen billion, six hundred twenty-one million, eight hundred forty thousand, three hundred twenty".