20066999 has 4 divisors (see below), whose sum is σ = 20556480. Its totient is φ = 19577520.

The previous prime is 20066989. The next prime is 20067001. The reversal of 20066999 is 99966002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99966002 = 2 ⋅49983001.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20066999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 489439 = 20066999 / (2 + 0 + 0 + 6 + 6 + 9 + 9 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20066909) 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 3 ways as a sum of consecutive naturals, for example, 244679 + ... + 244760.

It is an arithmetic number, because the mean of its divisors is an integer number (5139120).

Almost surely, 2^20066999 is an apocalyptic number.

20066999 is a deficient number, since it is larger than the sum of its proper divisors (489481).

20066999 is an equidigital number, since it uses as much as digits as its factorization.

20066999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489480.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 20066999 is about 4479.6204080257. The cubic root of 20066999 is about 271.7445292685.

The spelling of 20066999 in words is "twenty million, sixty-six thousand, nine hundred ninety-nine".