19478820 has 24 divisors (see below), whose sum is σ = 54540864. Its totient is φ = 5194336.

The previous prime is 19478803. The next prime is 19478831. The reversal of 19478820 is 2887491.

It is a plaindrome in base 8.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162264 + ... + 162383.

It is an arithmetic number, because the mean of its divisors is an integer number (2272536).

Almost surely, 2^19478820 is an apocalyptic number.

19478820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19478820 is an abundant number, since it is smaller than the sum of its proper divisors (35062044).

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

19478820 is a wasteful number, since it uses less digits than its factorization.

19478820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324659 (or 324657 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 19478820 is about 4413.4816188583. The cubic root of 19478820 is about 269.0631453498.

The spelling of 19478820 in words is "nineteen million, four hundred seventy-eight thousand, eight hundred twenty".