19859420 has 24 divisors (see below), whose sum is σ = 47662944. Its totient is φ = 6808896.

The previous prime is 19859387. The next prime is 19859429. The reversal of 19859420 is 2495891.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19859429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70787 + ... + 71066.

It is an arithmetic number, because the mean of its divisors is an integer number (1985956).

Almost surely, 2^19859420 is an apocalyptic number.

19859420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19859420 is an abundant number, since it is smaller than the sum of its proper divisors (27803524).

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

19859420 is a wasteful number, since it uses less digits than its factorization.

19859420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141869 (or 141867 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 19859420 is about 4456.3909164255. The cubic root of 19859420 is about 270.8042776456.

The spelling of 19859420 in words is "nineteen million, eight hundred fifty-nine thousand, four hundred twenty".