19880447 has 4 divisors (see below), whose sum is σ = 19890960. Its totient is φ = 19869936.

The previous prime is 19880437. The next prime is 19880461. The reversal of 19880447 is 74408891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 74408891 = 41 ⋅1814851.

It is a cyclic number.

It is not a de Polignac number, because 19880447 - 2⁴ = 19880431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19880417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1547 + ... + 6492.

It is an arithmetic number, because the mean of its divisors is an integer number (4972740).

Almost surely, 2^19880447 is an apocalyptic number.

19880447 is a deficient number, since it is larger than the sum of its proper divisors (10513).

19880447 is an equidigital number, since it uses as much as digits as its factorization.

19880447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10512.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 19880447 is about 4458.7494883655. The cubic root of 19880447 is about 270.8998190909.

The spelling of 19880447 in words is "nineteen million, eight hundred eighty thousand, four hundred forty-seven".