19985355 has 48 divisors (see below), whose sum is σ = 37739520. Its totient is φ = 9725184.

The previous prime is 19985351. The next prime is 19985401. The reversal of 19985355 is 55358991.

It is not a de Polignac number, because 19985355 - 2² = 19985351 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

Together with 17754165 it forms an amicable pair .

It is a self number, because there is not a number n which added to its sum of digits gives 19985355.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19985351) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 74161 + ... + 74429.

It is an arithmetic number, because the mean of its divisors is an integer number (786240).

Almost surely, 2^19985355 is an apocalyptic number.

19985355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19985355 is a deficient number, since it is larger than the sum of its proper divisors (17754165).

19985355 is a wasteful number, since it uses less digits than its factorization.

19985355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420 (or 417 counting only the distinct ones).

The product of its digits is 243000, while the sum is 45.

The square root of 19985355 is about 4470.4982943739. The cubic root of 19985355 is about 271.3754910713.

The spelling of 19985355 in words is "nineteen million, nine hundred eighty-five thousand, three hundred fifty-five".