19649916 has 108 divisors (see below), whose sum is σ = 58965816. Its totient is φ = 5480640.

The previous prime is 19649899. The next prime is 19649953. The reversal of 19649916 is 61994691.

It is a super-2 number, since 2×19649916² = 772238397614112, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 56455 + ... + 56801.

Almost surely, 2^19649916 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19649916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29482908).

19649916 is an abundant number, since it is smaller than the sum of its proper divisors (39315900).

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

19649916 is a wasteful number, since it uses less digits than its factorization.

19649916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392 (or 376 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 19649916 is about 4432.8225770946. The cubic root of 19649916 is about 269.8486394438.

The spelling of 19649916 in words is "nineteen million, six hundred forty-nine thousand, nine hundred sixteen".