19946993 has 8 divisors (see below), whose sum is σ = 21803040. Its totient is φ = 18098080.

The previous prime is 19946989. The next prime is 19947019. The reversal of 19946993 is 39964991.

It is a happy number.

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

It is not a de Polignac number, because 19946993 - 2² = 19946989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19946923) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 5318 + ... + 8256.

It is an arithmetic number, because the mean of its divisors is an integer number (2725380).

Almost surely, 2^19946993 is an apocalyptic number.

It is an amenable number.

19946993 is a deficient number, since it is larger than the sum of its proper divisors (1856047).

19946993 is a wasteful number, since it uses less digits than its factorization.

19946993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3567.

The product of its digits is 472392, while the sum is 50.

The square root of 19946993 is about 4466.2056602893. The cubic root of 19946993 is about 271.2017442667.

The spelling of 19946993 in words is "nineteen million, nine hundred forty-six thousand, nine hundred ninety-three".