19794864 has 80 divisors (see below), whose sum is σ = 53996544. Its totient is φ = 6240000.

The previous prime is 19794823. The next prime is 19794937. The reversal of 19794864 is 46849791.

It is a super-3 number, since 3×19794864³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78739 + ... + 78989.

Almost surely, 2^19794864 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 19794864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26998272).

19794864 is an abundant number, since it is smaller than the sum of its proper divisors (34201680).

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

19794864 is a wasteful number, since it uses less digits than its factorization.

19794864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 340 counting only the distinct ones).

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

The square root of 19794864 is about 4449.1419397452. The cubic root of 19794864 is about 270.5105292567.

The spelling of 19794864 in words is "nineteen million, seven hundred ninety-four thousand, eight hundred sixty-four".