20564338 has 8 divisors (see below), whose sum is σ = 30874032. Its totient is φ = 10272996.

The previous prime is 20564321. The next prime is 20564359. The reversal of 20564338 is 83346502.

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

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, 1320 + ... + 6547.

It is an arithmetic number, because the mean of its divisors is an integer number (3859254).

Almost surely, 2^20564338 is an apocalyptic number.

20564338 is a deficient number, since it is larger than the sum of its proper divisors (10309694).

20564338 is a wasteful number, since it uses less digits than its factorization.

20564338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9176.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 20564338 is about 4534.7919467160. The cubic root of 20564338 is about 273.9711994876.

It can be divided in two parts, 20564 and 338, that added together give a palindrome (20902).

The spelling of 20564338 in words is "twenty million, five hundred sixty-four thousand, three hundred thirty-eight".