19996278 has 8 divisors (see below), whose sum is σ = 39992568. Its totient is φ = 6665424.

The previous prime is 19996261. The next prime is 19996279. The reversal of 19996278 is 87269991.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

19996278 is an admirable number.

It is a super-2 number, since 2×19996278² = 799702267706568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19996278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19996279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1666351 + ... + 1666362.

It is an arithmetic number, because the mean of its divisors is an integer number (4999071).

Almost surely, 2^19996278 is an apocalyptic number.

19996278 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19996278 is a wasteful number, since it uses less digits than its factorization.

19996278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3332718.

The product of its digits is 489888, while the sum is 51.

The square root of 19996278 is about 4471.7198033866. The cubic root of 19996278 is about 271.4249221776.

The spelling of 19996278 in words is "nineteen million, nine hundred ninety-six thousand, two hundred seventy-eight".