19947258 has 12 divisors (see below), whose sum is σ = 43219098. Its totient is φ = 6649080.

The previous prime is 19947247. The next prime is 19947259. The reversal of 19947258 is 85274991.

It can be written as a sum of positive squares in only one way, i.e., 17114769 + 2832489 = 4137^2 + 1683^2 .

It is not an unprimeable number, because it can be changed into a prime (19947259) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 554073 + ... + 554108.

Almost surely, 2^19947258 is an apocalyptic number.

19947258 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19947258 is an abundant number, since it is smaller than the sum of its proper divisors (23271840).

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

19947258 is a wasteful number, since it uses less digits than its factorization.

19947258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108189 (or 1108186 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 19947258 is about 4466.2353274318. The cubic root of 19947258 is about 271.2029452522.

The spelling of 19947258 in words is "nineteen million, nine hundred forty-seven thousand, two hundred fifty-eight".