20505266 has 8 divisors (see below), whose sum is σ = 31045680. Its totient is φ = 10156708.

The previous prime is 20505263. The next prime is 20505269. The reversal of 20505266 is 66250502.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20505263) and next prime (20505269).

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 (20505263) 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, 47696 + ... + 48123.

It is an arithmetic number, because the mean of its divisors is an integer number (3880710).

Almost surely, 2^20505266 is an apocalyptic number.

20505266 is a deficient number, since it is larger than the sum of its proper divisors (10540414).

20505266 is a wasteful number, since it uses less digits than its factorization.

20505266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95928.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20505266 is about 4528.2740641441. The cubic root of 20505266 is about 273.7086163056.

Adding to 20505266 its reverse (66250502), we get a palindrome (86755768).

The spelling of 20505266 in words is "twenty million, five hundred five thousand, two hundred sixty-six".