19966627 has 4 divisors (see below), whose sum is σ = 20119176. Its totient is φ = 19814080.

The previous prime is 19966621. The next prime is 19966633. The reversal of 19966627 is 72666991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72666991 = 1223 ⋅59417.

It is an interprime number because it is at equal distance from previous prime (19966621) and next prime (19966633).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19966627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19966621) 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, 76078 + ... + 76339.

It is an arithmetic number, because the mean of its divisors is an integer number (5029794).

Almost surely, 2^19966627 is an apocalyptic number.

19966627 is a deficient number, since it is larger than the sum of its proper divisors (152549).

19966627 is a wasteful number, since it uses less digits than its factorization.

19966627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152548.

The product of its digits is 244944, while the sum is 46.

The square root of 19966627 is about 4468.4031823460. The cubic root of 19966627 is about 271.2906971719.

The spelling of 19966627 in words is "nineteen million, nine hundred sixty-six thousand, six hundred twenty-seven".