20066506 has 8 divisors (see below), whose sum is σ = 30913380. Its totient is φ = 9762048.

The previous prime is 20066503. The next prime is 20066513. The reversal of 20066506 is 60566002.

It can be written as a sum of positive squares in 2 ways, for example, as 16475481 + 3591025 = 4059^2 + 1895^2 .

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 (20066503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135511 + ... + 135658.

Almost surely, 2^20066506 is an apocalyptic number.

20066506 is a deficient number, since it is larger than the sum of its proper divisors (10846874).

20066506 is a wasteful number, since it uses less digits than its factorization.

20066506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271208.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20066506 is about 4479.5653807038. The cubic root of 20066506 is about 271.7423038709.

The spelling of 20066506 in words is "twenty million, sixty-six thousand, five hundred six".