20564226 has 16 divisors (see below), whose sum is σ = 45698400. Its totient is φ = 6854724.

The previous prime is 20564209. The next prime is 20564279. The reversal of 20564226 is 62246502.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 20564226.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190356 + ... + 190463.

It is an arithmetic number, because the mean of its divisors is an integer number (2856150).

Almost surely, 2^20564226 is an apocalyptic number.

20564226 is an abundant number, since it is smaller than the sum of its proper divisors (25134174).

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

20564226 is a wasteful number, since it uses less digits than its factorization.

20564226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380830 (or 380824 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 20564226 is about 4534.7795977313. The cubic root of 20564226 is about 273.9707021083.

It can be divided in two parts, 20564 and 226, that multiplied together give a palindrome (4647464).

The spelling of 20564226 in words is "twenty million, five hundred sixty-four thousand, two hundred twenty-six".