19947994 has 8 divisors (see below), whose sum is σ = 32642208. Its totient is φ = 9067260.

The previous prime is 19947979. The next prime is 19947997. The reversal of 19947994 is 49974991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (19947997) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 453342 + ... + 453385.

It is an arithmetic number, because the mean of its divisors is an integer number (4080276).

Almost surely, 2^19947994 is an apocalyptic number.

19947994 is a deficient number, since it is larger than the sum of its proper divisors (12694214).

19947994 is a wasteful number, since it uses less digits than its factorization.

19947994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906740.

The product of its digits is 734832, while the sum is 52.

The square root of 19947994 is about 4466.3177226883. The cubic root of 19947994 is about 271.2062807635.

The spelling of 19947994 in words is "nineteen million, nine hundred forty-seven thousand, nine hundred ninety-four".