19999946 has 4 divisors (see below), whose sum is σ = 29999922.
Its totient is φ = 9999972.
The previous prime is 19999927. The next prime is 19999963. The reversal of 19999946 is 64999991.
Adding to 19999946 its sum of digits (56), we get a palindrome (20000002).
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in only one way, i.e., 11526025 + 8473921 = 3395^2 + 2911^2
It is a junction number, because it is equal to n+sod(n) for n = 19999891 and 19999900.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999985 + ... + 4999988.
Almost surely, 219999946 is an apocalyptic number.
19999946 is a deficient number, since it is larger than the sum of its proper divisors (9999976).
19999946 is an equidigital number, since it uses as much as digits as its factorization.
19999946 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 9999975.
The product of its digits is 1417176, while the sum is 56.
The square root of 19999946 is about 4472.1299176120.
The cubic root of 19999946 is about 271.4415173617.
The spelling of 19999946 in words is "nineteen million, nine hundred ninety-nine thousand, nine hundred forty-six".