19855264 has 48 divisors (see below), whose sum is σ = 45934560. Its totient is φ = 8328960.

The previous prime is 19855259. The next prime is 19855271. The reversal of 19855264 is 46255891.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2407 + ... + 6745.

It is an arithmetic number, because the mean of its divisors is an integer number (956970).

Almost surely, 2^19855264 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 19855264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22967280).

19855264 is an abundant number, since it is smaller than the sum of its proper divisors (26079296).

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

19855264 is a wasteful number, since it uses less digits than its factorization.

19855264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4373 (or 4365 counting only the distinct ones).

The product of its digits is 86400, while the sum is 40.

The square root of 19855264 is about 4455.9245954123. The cubic root of 19855264 is about 270.7853858368.

The spelling of 19855264 in words is "nineteen million, eight hundred fifty-five thousand, two hundred sixty-four".