19917136 has 10 divisors (see below), whose sum is σ = 38589482. Its totient is φ = 9958560.

The previous prime is 19917067. The next prime is 19917167. The reversal of 19917136 is 63171991.

It can be written as a sum of positive squares in only one way, i.e., 19184400 + 732736 = 4380^2 + 856^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19917095 and 19917104.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622395 + ... + 622426.

Almost surely, 2^19917136 is an apocalyptic number.

19917136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

19917136 is the 2386-th centered heptagonal number.

It is an amenable number.

19917136 is a deficient number, since it is larger than the sum of its proper divisors (18672346).

19917136 is a wasteful number, since it uses less digits than its factorization.

19917136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244829 (or 1244823 counting only the distinct ones).

The product of its digits is 10206, while the sum is 37.

The square root of 19917136 is about 4462.8618620791. The cubic root of 19917136 is about 271.0663635624.

The spelling of 19917136 in words is "nineteen million, nine hundred seventeen thousand, one hundred thirty-six".