20656136 has 32 divisors (see below), whose sum is σ = 39852000. Its totient is φ = 10033536.

The previous prime is 20656121. The next prime is 20656183. The reversal of 20656136 is 63165602.

It is a junction number, because it is equal to n+sod(n) for n = 20656099 and 20656108.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50300 + ... + 50708.

It is an arithmetic number, because the mean of its divisors is an integer number (1245375).

Almost surely, 2^20656136 is an apocalyptic number.

It is an amenable number.

20656136 is a deficient number, since it is larger than the sum of its proper divisors (19195864).

20656136 is a wasteful number, since it uses less digits than its factorization.

20656136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581 (or 577 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 20656136 is about 4544.9021991678. The cubic root of 20656136 is about 274.3782581861.

The spelling of 20656136 in words is "twenty million, six hundred fifty-six thousand, one hundred thirty-six".