20561935 has 8 divisors (see below), whose sum is σ = 24869376. Its totient is φ = 16319520.

The previous prime is 20561927. The next prime is 20561999. The reversal of 20561935 is 53916502.

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

It is not a de Polignac number, because 20561935 - 2³ = 20561927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20561897 and 20561906.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15556 + ... + 16825.

It is an arithmetic number, because the mean of its divisors is an integer number (3108672).

Almost surely, 2^20561935 is an apocalyptic number.

20561935 is a deficient number, since it is larger than the sum of its proper divisors (4307441).

20561935 is a wasteful number, since it uses less digits than its factorization.

20561935 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32513.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 20561935 is about 4534.5269874597. The cubic root of 20561935 is about 273.9605276401.

The spelling of 20561935 in words is "twenty million, five hundred sixty-one thousand, nine hundred thirty-five".