20659791285 has 64 divisors (see below), whose sum is σ = 43800514560. Its totient is φ = 9033837120.

The previous prime is 20659791281. The next prime is 20659791319. The reversal of 20659791285 is 58219795602.

20659791285 is a `hidden beast` number, since 20 + 6 + 597 + 9 + 1 + 28 + 5 = 666.

It is not a de Polignac number, because 20659791285 - 2² = 20659791281 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20659791281) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 453531 + ... + 497000.

It is an arithmetic number, because the mean of its divisors is an integer number (684383040).

Almost surely, 2^20659791285 is an apocalyptic number.

It is an amenable number.

20659791285 is an abundant number, since it is smaller than the sum of its proper divisors (23140723275).

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

20659791285 is a wasteful number, since it uses less digits than its factorization.

20659791285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950575 (or 950569 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 54.

The spelling of 20659791285 in words is "twenty billion, six hundred fifty-nine million, seven hundred ninety-one thousand, two hundred eighty-five".