20616266550 has 96 divisors (see below), whose sum is σ = 55858210560. Its totient is φ = 4990550400.

The previous prime is 20616266549. The next prime is 20616266579. The reversal of 20616266550 is 5566261602.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20616266499 and 20616266508.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1161039 + ... + 1178661.

It is an arithmetic number, because the mean of its divisors is an integer number (581856360).

Almost surely, 2^20616266550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20616266550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27929105280).

20616266550 is an abundant number, since it is smaller than the sum of its proper divisors (35241944010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20616266550 is a wasteful number, since it uses less digits than its factorization.

20616266550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18358 (or 18353 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 20616266550 in words is "twenty billion, six hundred sixteen million, two hundred sixty-six thousand, five hundred fifty".