19888420 has 24 divisors (see below), whose sum is σ = 42090048. Its totient is φ = 7893600.

The previous prime is 19888417. The next prime is 19888439. The reversal of 19888420 is 2488891.

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, 1176 + ... + 6415.

It is an arithmetic number, because the mean of its divisors is an integer number (1753752).

Almost surely, 2^19888420 is an apocalyptic number.

19888420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19888420 is an abundant number, since it is smaller than the sum of its proper divisors (22201628).

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

19888420 is a wasteful number, since it uses less digits than its factorization.

19888420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7731 (or 7729 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 19888420 is about 4459.6434835085. The cubic root of 19888420 is about 270.9360287996.

The spelling of 19888420 in words is "nineteen million, eight hundred eighty-eight thousand, four hundred twenty".