19847420 has 12 divisors (see below), whose sum is σ = 41679624. Its totient is φ = 7938960.

The previous prime is 19847371. The next prime is 19847431. The reversal of 19847420 is 2474891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 496166 + ... + 496205.

It is an arithmetic number, because the mean of its divisors is an integer number (3473302).

Almost surely, 2^19847420 is an apocalyptic number.

19847420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19847420 is an abundant number, since it is smaller than the sum of its proper divisors (21832204).

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

19847420 is a wasteful number, since it uses less digits than its factorization.

19847420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992380 (or 992378 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 19847420 is about 4455.0443319904. The cubic root of 19847420 is about 270.7497224088.

The spelling of 19847420 in words is "nineteen million, eight hundred forty-seven thousand, four hundred twenty".