20555516 has 12 divisors (see below), whose sum is σ = 38088288. Its totient is φ = 9673152.

The previous prime is 20555503. The next prime is 20555527. The reversal of 20555516 is 61555502.

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, 151076 + ... + 151211.

It is an arithmetic number, because the mean of its divisors is an integer number (3174024).

Almost surely, 2^20555516 is an apocalyptic number.

It is an amenable number.

20555516 is a deficient number, since it is larger than the sum of its proper divisors (17532772).

20555516 is a wasteful number, since it uses less digits than its factorization.

20555516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302308 (or 302306 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 29.

The square root of 20555516 is about 4533.8191406363. The cubic root of 20555516 is about 273.9320164510.

The spelling of 20555516 in words is "twenty million, five hundred fifty-five thousand, five hundred sixteen".