19388620090 has 32 divisors (see below), whose sum is σ = 40272410880. Its totient is φ = 6582985344.

The previous prime is 19388620087. The next prime is 19388620133. The reversal of 19388620090 is 9002688391.

It is a self number, because there is not a number n which added to its sum of digits gives 19388620090.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1337355 + ... + 1351774.

It is an arithmetic number, because the mean of its divisors is an integer number (1258512840).

Almost surely, 2^19388620090 is an apocalyptic number.

19388620090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19388620090 is an abundant number, since it is smaller than the sum of its proper divisors (20883790790).

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

19388620090 is a wasteful number, since it uses less digits than its factorization.

19388620090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2689246.

The product of its (nonzero) digits is 186624, while the sum is 46.

The spelling of 19388620090 in words is "nineteen billion, three hundred eighty-eight million, six hundred twenty thousand, ninety".