20266657 has 4 divisors (see below), whose sum is σ = 21147840. Its totient is φ = 19385476.

The previous prime is 20266643. The next prime is 20266661. The reversal of 20266657 is 75666202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20266657 - 2¹¹ = 20264609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20266607) 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, 440557 + ... + 440602.

It is an arithmetic number, because the mean of its divisors is an integer number (5286960).

Almost surely, 2^20266657 is an apocalyptic number.

It is an amenable number.

20266657 is a deficient number, since it is larger than the sum of its proper divisors (881183).

20266657 is an equidigital number, since it uses as much as digits as its factorization.

20266657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881182.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 20266657 is about 4501.8503973366. The cubic root of 20266657 is about 272.6428036962.

The spelling of 20266657 in words is "twenty million, two hundred sixty-six thousand, six hundred fifty-seven".