19843420 has 24 divisors (see below), whose sum is σ = 44123184. Its totient is φ = 7470336.

The previous prime is 19843409. The next prime is 19843427. The reversal of 19843420 is 2434891.

It is a super-2 number, since 2×19843420² = 787522634592800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19843427) 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 7 ways as a sum of consecutive naturals, for example, 28842 + ... + 29521.

It is an arithmetic number, because the mean of its divisors is an integer number (1838466).

Almost surely, 2^19843420 is an apocalyptic number.

19843420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19843420 is an abundant number, since it is smaller than the sum of its proper divisors (24279764).

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

19843420 is a wasteful number, since it uses less digits than its factorization.

19843420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58389 (or 58387 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 19843420 is about 4454.5953800542. The cubic root of 19843420 is about 270.7315324433.

The spelling of 19843420 in words is "nineteen million, eight hundred forty-three thousand, four hundred twenty".