20685847236480 has 1536 divisors, whose sum is σ = 81043889472000. Its totient is φ = 5021971218432.

The previous prime is 20685847236473. The next prime is 20685847236533. The reversal of 20685847236480 is 8463274858602.

20685847236480 is a `hidden beast` number, since 2 + 0 + 6 + 8 + 5 + 84 + 72 + 3 + 6 + 480 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 24250699734 + ... + 24250700586.

It is an arithmetic number, because the mean of its divisors is an integer number (52762948875).

Almost surely, 2^{20685847236480} is an apocalyptic number.

20685847236480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20685847236480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40521944736000).

20685847236480 is an abundant number, since it is smaller than the sum of its proper divisors (60358042235520).

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

20685847236480 is a wasteful number, since it uses less digits than its factorization.

20685847236480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218 (or 1194 counting only the distinct ones).

The product of its (nonzero) digits is 123863040, while the sum is 63.

The spelling of 20685847236480 in words is "twenty trillion, six hundred eighty-five billion, eight hundred forty-seven million, two hundred thirty-six thousand, four hundred eighty".