20668061765358 has 96 divisors (see below), whose sum is σ = 52039027003392. Its totient is φ = 5805899726400.

The previous prime is 20668061765341. The next prime is 20668061765453. The reversal of 20668061765358 is 85356716086602.

20668061765358 is a `hidden beast` number, since 2 + 0 + 6 + 6 + 8 + 0 + 617 + 6 + 5 + 3 + 5 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20668061765295 and 20668061765304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17656435 + ... + 18790577.

It is an arithmetic number, because the mean of its divisors is an integer number (542073197952).

Almost surely, 2^{20668061765358} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20668061765358, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26019513501696).

20668061765358 is an abundant number, since it is smaller than the sum of its proper divisors (31370965238034).

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

20668061765358 is a wasteful number, since it uses less digits than its factorization.

20668061765358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136590 (or 1136587 counting only the distinct ones).

The product of its (nonzero) digits is 87091200, while the sum is 63.

The spelling of 20668061765358 in words is "twenty trillion, six hundred sixty-eight billion, sixty-one million, seven hundred sixty-five thousand, three hundred fifty-eight".