20506226 has 8 divisors (see below), whose sum is σ = 33125484. Its totient is φ = 9464400.

The previous prime is 20506201. The next prime is 20506243. The reversal of 20506226 is 62260502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20241001 + 265225 = 4499^2 + 515^2 .

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

It is a Curzon number.

It is an unprimeable number.

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, 394325 + ... + 394376.

Almost surely, 2^20506226 is an apocalyptic number.

20506226 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20506226 is a deficient number, since it is larger than the sum of its proper divisors (12619258).

20506226 is a wasteful number, since it uses less digits than its factorization.

20506226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788716.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20506226 is about 4528.3800635547. The cubic root of 20506226 is about 273.7128876664.

Adding to 20506226 its reverse (62260502), we get a palindrome (82766728).

The spelling of 20506226 in words is "twenty million, five hundred six thousand, two hundred twenty-six".