19820000020 has 24 divisors (see below), whose sum is σ = 41629891968. Its totient is φ = 7926496800.

The previous prime is 19819999987. The next prime is 19820000029. The reversal of 19820000020 is 2000002891.

It is a junction number, because it is equal to n+sod(n) for n = 19819999946 and 19820000000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19820000029) by changing a digit.

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, 17385 + ... + 199855.

It is an arithmetic number, because the mean of its divisors is an integer number (1734578832).

Almost surely, 2^19820000020 is an apocalyptic number.

19820000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19820000020 is an abundant number, since it is smaller than the sum of its proper divisors (21809891948).

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

19820000020 is a wasteful number, since it uses less digits than its factorization.

19820000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187911 (or 187909 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 19820000020 in words is "nineteen billion, eight hundred twenty million, twenty", and thus it is an aban number.