20563266 has 8 divisors (see below), whose sum is σ = 41126544. Its totient is φ = 6854420.

The previous prime is 20563259. The next prime is 20563307. The reversal of 20563266 is 66236502.

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

20563266 is an admirable number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1713600 + ... + 1713611.

It is an arithmetic number, because the mean of its divisors is an integer number (5140818).

Almost surely, 2^20563266 is an apocalyptic number.

20563266 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20563266 is a wasteful number, since it uses less digits than its factorization.

20563266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3427216.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 20563266 is about 4534.6737479118. The cubic root of 20563266 is about 273.9664387828.

Adding to 20563266 its reverse (66236502), we get a palindrome (86799768).

The spelling of 20563266 in words is "twenty million, five hundred sixty-three thousand, two hundred sixty-six".