20257066 has 8 divisors (see below), whose sum is σ = 31706784. Its totient is φ = 9688140.

The previous prime is 20256967. The next prime is 20257067. The reversal of 20257066 is 66075202.

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 (20257067) 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, 220140 + ... + 220231.

It is an arithmetic number, because the mean of its divisors is an integer number (3963348).

Almost surely, 2^20257066 is an apocalyptic number.

20257066 is a deficient number, since it is larger than the sum of its proper divisors (11449718).

20257066 is a wasteful number, since it uses less digits than its factorization.

20257066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440396.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 20257066 is about 4500.7850426342. The cubic root of 20257066 is about 272.5997883840.

The spelling of 20257066 in words is "twenty million, two hundred fifty-seven thousand, sixty-six".