19420380 has 72 divisors (see below), whose sum is σ = 67328352. Its totient is φ = 4438656.

The previous prime is 19420369. The next prime is 19420397. The reversal of 19420380 is 8302491.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6447 + ... + 8966.

It is an arithmetic number, because the mean of its divisors is an integer number (935116).

Almost surely, 2^19420380 is an apocalyptic number.

19420380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19420380 is an abundant number, since it is smaller than the sum of its proper divisors (47907972).

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

19420380 is a wasteful number, since it uses less digits than its factorization.

19420380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15435 (or 15430 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 19420380 is about 4406.8560221546. The cubic root of 19420380 is about 268.7937963598.

The spelling of 19420380 in words is "nineteen million, four hundred twenty thousand, three hundred eighty".