20226505 has 8 divisors (see below), whose sum is σ = 26138952. Its totient is φ = 14936448.

The previous prime is 20226491. The next prime is 20226509. The reversal of 20226505 is 50562202.

It can be written as a sum of positive squares in 4 ways, for example, as 1468944 + 18757561 = 1212^2 + 4331^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20226505 - 2⁵ = 20226473 is a prime.

It is a super-2 number, since 2×20226505² = 818223009030050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20226509) 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 7 ways as a sum of consecutive naturals, for example, 155524 + ... + 155653.

It is an arithmetic number, because the mean of its divisors is an integer number (3267369).

Almost surely, 2^20226505 is an apocalyptic number.

It is an amenable number.

20226505 is a deficient number, since it is larger than the sum of its proper divisors (5912447).

20226505 is a wasteful number, since it uses less digits than its factorization.

20226505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311195.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20226505 is about 4497.3886867826. The cubic root of 20226505 is about 272.4626327012.

Adding to 20226505 its reverse (50562202), we get a palindrome (70788707).

The spelling of 20226505 in words is "twenty million, two hundred twenty-six thousand, five hundred five".