20572166 has 8 divisors (see below), whose sum is σ = 32199984. Its totient is φ = 9838840.

The previous prime is 20572163. The next prime is 20572171. The reversal of 20572166 is 66127502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20572163) 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, 223565 + ... + 223656.

It is an arithmetic number, because the mean of its divisors is an integer number (4024998).

Almost surely, 2^20572166 is an apocalyptic number.

20572166 is a deficient number, since it is larger than the sum of its proper divisors (11627818).

20572166 is a wasteful number, since it uses less digits than its factorization.

20572166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447246.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20572166 is about 4535.6549692409. The cubic root of 20572166 is about 274.0059582770.

Adding to 20572166 its reverse (66127502), we get a palindrome (86699668).

The spelling of 20572166 in words is "twenty million, five hundred seventy-two thousand, one hundred sixty-six".