19942666 has 16 divisors (see below), whose sum is σ = 33341760. Its totient is φ = 8890560.

The previous prime is 19942661. The next prime is 19942673. The reversal of 19942666 is 66624991.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (19942661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14790 + ... + 16081.

It is an arithmetic number, because the mean of its divisors is an integer number (2083860).

Almost surely, 2^19942666 is an apocalyptic number.

19942666 is a deficient number, since it is larger than the sum of its proper divisors (13399094).

19942666 is a wasteful number, since it uses less digits than its factorization.

19942666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30909.

The product of its digits is 139968, while the sum is 43.

The square root of 19942666 is about 4465.7212183476. The cubic root of 19942666 is about 271.1821327091.

The spelling of 19942666 in words is "nineteen million, nine hundred forty-two thousand, six hundred sixty-six".