20569138 has 8 divisors (see below), whose sum is σ = 30873132. Its totient is φ = 10278096.

The previous prime is 20569117. The next prime is 20569147. The reversal of 20569138 is 83196502.

It can be written as a sum of positive squares in 2 ways, for example, as 18948609 + 1620529 = 4353^2 + 1273^2 .

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, 3756 + ... + 7432.

Almost surely, 2^20569138 is an apocalyptic number.

20569138 is a deficient number, since it is larger than the sum of its proper divisors (10303994).

20569138 is a wasteful number, since it uses less digits than its factorization.

20569138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6476.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 20569138 is about 4535.3211573162. The cubic root of 20569138 is about 273.9925140477.

The spelling of 20569138 in words is "twenty million, five hundred sixty-nine thousand, one hundred thirty-eight".