20066537 has 4 divisors (see below), whose sum is σ = 20090196. Its totient is φ = 20042880.

The previous prime is 20066533. The next prime is 20066539. The reversal of 20066537 is 73566002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11162281 + 8904256 = 3341^2 + 2984^2 .

It is a cyclic number.

It is not a de Polignac number, because 20066537 - 2² = 20066533 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20066533) 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, 10508 + ... + 12269.

It is an arithmetic number, because the mean of its divisors is an integer number (5022549).

Almost surely, 2^20066537 is an apocalyptic number.

It is an amenable number.

20066537 is a deficient number, since it is larger than the sum of its proper divisors (23659).

20066537 is an equidigital number, since it uses as much as digits as its factorization.

20066537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23658.

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 20066537 is about 4479.5688408596. The cubic root of 20066537 is about 271.7424438057.

The spelling of 20066537 in words is "twenty million, sixty-six thousand, five hundred thirty-seven".