20685684712 has 384 divisors, whose sum is σ = 54422323200. Its totient is φ = 7185024000.

The previous prime is 20685684671. The next prime is 20685684727. The reversal of 20685684712 is 21748658602.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

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, 283365508 + ... + 283365580.

It is an arithmetic number, because the mean of its divisors is an integer number (141724800).

Almost surely, 2^20685684712 is an apocalyptic number.

20685684712 is a gapful number since it is divisible by the number (22) 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 20685684712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27211161600).

20685684712 is an abundant number, since it is smaller than the sum of its proper divisors (33736638488).

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

20685684712 is a wasteful number, since it uses less digits than its factorization.

20685684712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 49.

The spelling of 20685684712 in words is "twenty billion, six hundred eighty-five million, six hundred eighty-four thousand, seven hundred twelve".