19778496 has 56 divisors (see below), whose sum is σ = 54034944. Its totient is φ = 6378240.

The previous prime is 19778491. The next prime is 19778509. The reversal of 19778496 is 69487791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19778491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4291 + ... + 7613.

Almost surely, 2^19778496 is an apocalyptic number.

19778496 is a gapful number since it is divisible by the number (16) 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 19778496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27017472).

19778496 is an abundant number, since it is smaller than the sum of its proper divisors (34256448).

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

19778496 is a wasteful number, since it uses less digits than its factorization.

19778496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3369 (or 3359 counting only the distinct ones).

The product of its digits is 762048, while the sum is 51.

The square root of 19778496 is about 4447.3021035230. The cubic root of 19778496 is about 270.4359486769.

The spelling of 19778496 in words is "nineteen million, seven hundred seventy-eight thousand, four hundred ninety-six".