19478420 has 48 divisors (see below), whose sum is σ = 46381440. Its totient is φ = 6811776.

The previous prime is 19478419. The next prime is 19478423. The reversal of 19478420 is 2487491.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19478423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2969 + ... + 6911.

It is an arithmetic number, because the mean of its divisors is an integer number (966280).

Almost surely, 2^19478420 is an apocalyptic number.

19478420 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 19478420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23190720).

19478420 is an abundant number, since it is smaller than the sum of its proper divisors (26903020).

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

19478420 is a wasteful number, since it uses less digits than its factorization.

19478420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3984 (or 3982 counting only the distinct ones).

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

The square root of 19478420 is about 4413.4363029277. The cubic root of 19478420 is about 269.0613035888.

The spelling of 19478420 in words is "nineteen million, four hundred seventy-eight thousand, four hundred twenty".