20561336 has 16 divisors (see below), whose sum is σ = 39493440. Its totient is φ = 10029760.

The previous prime is 20561329. The next prime is 20561351. The reversal of 20561336 is 63316502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31016 + ... + 31671.

It is an arithmetic number, because the mean of its divisors is an integer number (2468340).

Almost surely, 2^20561336 is an apocalyptic number.

It is an amenable number.

20561336 is a deficient number, since it is larger than the sum of its proper divisors (18932104).

20561336 is a wasteful number, since it uses less digits than its factorization.

20561336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62734 (or 62730 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 20561336 is about 4534.4609381932. The cubic root of 20561336 is about 273.9578673206.

Adding to 20561336 its reverse (63316502), we get a palindrome (83877838).

The spelling of 20561336 in words is "twenty million, five hundred sixty-one thousand, three hundred thirty-six".