19978446 has 32 divisors (see below), whose sum is σ = 42375168. Its totient is φ = 6268320.

The previous prime is 19978393. The next prime is 19978457. The reversal of 19978446 is 64487991.

It is a junction number, because it is equal to n+sod(n) for n = 19978395 and 19978404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5431 + ... + 8333.

It is an arithmetic number, because the mean of its divisors is an integer number (1324224).

Almost surely, 2^19978446 is an apocalyptic number.

19978446 is an abundant number, since it is smaller than the sum of its proper divisors (22396722).

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

19978446 is a wasteful number, since it uses less digits than its factorization.

19978446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2976.

The product of its digits is 435456, while the sum is 48.

The square root of 19978446 is about 4469.7254949270. The cubic root of 19978446 is about 271.3442156805.

The spelling of 19978446 in words is "nineteen million, nine hundred seventy-eight thousand, four hundred forty-six".