20266557 has 4 divisors (see below), whose sum is σ = 27022080. Its totient is φ = 13511036.

The previous prime is 20266553. The next prime is 20266577. The reversal of 20266557 is 75566202.

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 20266557 - 2² = 20266553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20266553) 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, 3377757 + ... + 3377762.

It is an arithmetic number, because the mean of its divisors is an integer number (6755520).

Almost surely, 2^20266557 is an apocalyptic number.

It is an amenable number.

20266557 is a deficient number, since it is larger than the sum of its proper divisors (6755523).

20266557 is an equidigital number, since it uses as much as digits as its factorization.

20266557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6755522.

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 20266557 is about 4501.8392907788. The cubic root of 20266557 is about 272.6423552696.

The spelling of 20266557 in words is "twenty million, two hundred sixty-six thousand, five hundred fifty-seven".