20939536 has 20 divisors (see below), whose sum is σ = 40641372. Its totient is φ = 10451456.

The previous prime is 20939519. The next prime is 20939543. The reversal of 20939536 is 63593902.

It can be written as a sum of positive squares in 2 ways, for example, as 8294400 + 12645136 = 2880^2 + 3556^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20939495 and 20939504.

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 3 ways as a sum of consecutive naturals, for example, 16956 + ... + 18148.

Almost surely, 2^20939536 is an apocalyptic number.

It is an amenable number.

20939536 is a deficient number, since it is larger than the sum of its proper divisors (19701836).

20939536 is a wasteful number, since it uses less digits than its factorization.

20939536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2298 (or 2292 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 37.

The square root of 20939536 is about 4575.9737761486. The cubic root of 20939536 is about 275.6273764499.

The spelling of 20939536 in words is "twenty million, nine hundred thirty-nine thousand, five hundred thirty-six".