19890346920 has 32 divisors (see below), whose sum is σ = 59671041120. Its totient is φ = 5304092480.

The previous prime is 19890346913. The next prime is 19890346943. The reversal of 19890346920 is 2964309891.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82876326 + ... + 82876565.

It is an arithmetic number, because the mean of its divisors is an integer number (1864720035).

Almost surely, 2^19890346920 is an apocalyptic number.

19890346920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19890346920 is an abundant number, since it is smaller than the sum of its proper divisors (39780694200).

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

19890346920 is a wasteful number, since it uses less digits than its factorization.

19890346920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165752905 (or 165752901 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 51.

The spelling of 19890346920 in words is "nineteen billion, eight hundred ninety million, three hundred forty-six thousand, nine hundred twenty".