19980478 has 24 divisors (see below), whose sum is σ = 35494992. Its totient is φ = 8262912.

The previous prime is 19980473. The next prime is 19980487. The reversal of 19980478 is 87408991.

It is a happy number.

It is a super-2 number, since 2×19980478² = 798439002216968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19980473) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10926 + ... + 12622.

It is an arithmetic number, because the mean of its divisors is an integer number (1478958).

Almost surely, 2^19980478 is an apocalyptic number.

19980478 is a deficient number, since it is larger than the sum of its proper divisors (15514514).

19980478 is a wasteful number, since it uses less digits than its factorization.

19980478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1764 (or 1735 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 19980478 is about 4469.9527961713. The cubic root of 19980478 is about 271.3534148069.

The spelling of 19980478 in words is "nineteen million, nine hundred eighty thousand, four hundred seventy-eight".