19917682 has 4 divisors (see below), whose sum is σ = 29876526. Its totient is φ = 9958840.

The previous prime is 19917673. The next prime is 19917683. The reversal of 19917682 is 28671991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28671991 = 73 ⋅392767.

It can be written as a sum of positive squares in only one way, i.e., 19900521 + 17161 = 4461^2 + 131^2 .

It is not an unprimeable number, because it can be changed into a prime (19917683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4979419 + ... + 4979422.

Almost surely, 2^19917682 is an apocalyptic number.

19917682 is a deficient number, since it is larger than the sum of its proper divisors (9958844).

19917682 is an equidigital number, since it uses as much as digits as its factorization.

19917682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9958843.

The product of its digits is 54432, while the sum is 43.

The square root of 19917682 is about 4462.9230331701. The cubic root of 19917682 is about 271.0688405062.

The spelling of 19917682 in words is "nineteen million, nine hundred seventeen thousand, six hundred eighty-two".