19902000020 has 24 divisors (see below), whose sum is σ = 47764800384. Its totient is φ = 6823542816.

The previous prime is 19902000007. The next prime is 19902000047. The reversal of 19902000020 is 2000020991.

It is a self number, because there is not a number n which added to its sum of digits gives 19902000020.

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 7 ways as a sum of consecutive naturals, for example, 71078432 + ... + 71078711.

It is an arithmetic number, because the mean of its divisors is an integer number (1990200016).

Almost surely, 2^19902000020 is an apocalyptic number.

19902000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19902000020 is an abundant number, since it is smaller than the sum of its proper divisors (27862800364).

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

19902000020 is a wasteful number, since it uses less digits than its factorization.

19902000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142157159 (or 142157157 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 23.

The spelling of 19902000020 in words is "nineteen billion, nine hundred two million, twenty", and thus it is an aban number.