19842920 has 16 divisors (see below), whose sum is σ = 44646660. Its totient is φ = 7937152.

The previous prime is 19842919. The next prime is 19842923. The reversal of 19842920 is 2924891.

It can be written as a sum of positive squares in 2 ways, for example, as 19731364 + 111556 = 4442^2 + 334^2 .

It is not an unprimeable number, because it can be changed into a prime (19842923) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 247997 + ... + 248076.

Almost surely, 2^19842920 is an apocalyptic number.

19842920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19842920 is an abundant number, since it is smaller than the sum of its proper divisors (24803740).

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

19842920 is a wasteful number, since it uses less digits than its factorization.

19842920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496084 (or 496080 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 19842920 is about 4454.5392578807. The cubic root of 19842920 is about 270.7292585258.

The spelling of 19842920 in words is "nineteen million, eight hundred forty-two thousand, nine hundred twenty".