20665226 has 16 divisors (see below), whose sum is σ = 32205600. Its totient is φ = 9933168.

The previous prime is 20665213. The next prime is 20665237. The reversal of 20665226 is 62256602.

It is a Harshad number since it is a multiple of its sum of digits (29).

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 7 ways as a sum of consecutive naturals, for example, 15785 + ... + 17043.

It is an arithmetic number, because the mean of its divisors is an integer number (2012850).

Almost surely, 2^20665226 is an apocalyptic number.

20665226 is a deficient number, since it is larger than the sum of its proper divisors (11540374).

20665226 is a wasteful number, since it uses less digits than its factorization.

20665226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 20665226 is about 4545.9021106927. The cubic root of 20665226 is about 274.4185001849.

The spelling of 20665226 in words is "twenty million, six hundred sixty-five thousand, two hundred twenty-six".