20855516 has 48 divisors (see below), whose sum is σ = 41572608. Its totient is φ = 9072000.

The previous prime is 20855501. The next prime is 20855519. The reversal of 20855516 is 61555802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20855519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138041 + ... + 138191.

It is an arithmetic number, because the mean of its divisors is an integer number (866096).

Almost surely, 2^20855516 is an apocalyptic number.

It is an amenable number.

20855516 is a deficient number, since it is larger than the sum of its proper divisors (20717092).

20855516 is a wasteful number, since it uses less digits than its factorization.

20855516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 20855516 is about 4566.7839887606. The cubic root of 20855516 is about 275.2582301684.

The spelling of 20855516 in words is "twenty million, eight hundred fifty-five thousand, five hundred sixteen".