20618956796850 has 192 divisors, whose sum is σ = 57130171113600. Its totient is φ = 5468105905920.

The previous prime is 20618956796831. The next prime is 20618956796899. The reversal of 20618956796850 is 5869765981602.

20618956796850 is a `hidden beast` number, since 2 + 0 + 6 + 1 + 8 + 9 + 567 + 9 + 6 + 8 + 50 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 272941684 + ... + 273017216.

It is an arithmetic number, because the mean of its divisors is an integer number (297552974550).

Almost surely, 2^{20618956796850} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20618956796850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28565085556800).

20618956796850 is an abundant number, since it is smaller than the sum of its proper divisors (36511214316750).

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

20618956796850 is a wasteful number, since it uses less digits than its factorization.

20618956796850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76666 (or 76655 counting only the distinct ones).

The product of its (nonzero) digits is 391910400, while the sum is 72.

The spelling of 20618956796850 in words is "twenty trillion, six hundred eighteen billion, nine hundred fifty-six million, seven hundred ninety-six thousand, eight hundred fifty".