20561044 has 24 divisors (see below), whose sum is σ = 41263040. Its totient is φ = 8781696.

The previous prime is 20561033. The next prime is 20561053. The reversal of 20561044 is 44016502.

20561044 = T₁₆₇ + T₁₆₈ + ... + T₅₀₃.

It is a congruent number.

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, 8347 + ... + 10525.

Almost surely, 2^20561044 is an apocalyptic number.

It is an amenable number.

20561044 is an abundant number, since it is smaller than the sum of its proper divisors (20701996).

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

20561044 is a wasteful number, since it uses less digits than its factorization.

20561044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2527 (or 2525 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20561044 is about 4534.4287402053. The cubic root of 20561044 is about 273.9565704517.

Adding to 20561044 its reverse (44016502), we get a palindrome (64577546).

The spelling of 20561044 in words is "twenty million, five hundred sixty-one thousand, forty-four".