19908420 has 96 divisors (see below), whose sum is σ = 64447488. Its totient is φ = 4497792.

The previous prime is 19908419. The next prime is 19908433. The reversal of 19908420 is 2480991.

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 31 ways as a sum of consecutive naturals, for example, 44719 + ... + 45161.

It is an arithmetic number, because the mean of its divisors is an integer number (671328).

Almost surely, 2^19908420 is an apocalyptic number.

19908420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19908420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32223744).

19908420 is an abundant number, since it is smaller than the sum of its proper divisors (44539068).

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

19908420 is a wasteful number, since it uses less digits than its factorization.

19908420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 19908420 is about 4461.8852517742. The cubic root of 19908420 is about 271.0268170609.

The spelling of 19908420 in words is "nineteen million, nine hundred eight thousand, four hundred twenty".