20851610486424 has 256 divisors, whose sum is σ = 57486288384000. Its totient is φ = 6276956152320.

The previous prime is 20851610486419. The next prime is 20851610486431. The reversal of 20851610486424 is 42468401615802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1961391589 + ... + 1961402219.

It is an arithmetic number, because the mean of its divisors is an integer number (224555814000).

Almost surely, 2^{20851610486424} is an apocalyptic number.

20851610486424 is a gapful number since it is divisible by the number (24) 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 20851610486424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28743144192000).

20851610486424 is an abundant number, since it is smaller than the sum of its proper divisors (36634677897576).

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

20851610486424 is a wasteful number, since it uses less digits than its factorization.

20851610486424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12558 (or 12554 counting only the distinct ones).

The product of its (nonzero) digits is 2949120, while the sum is 51.

The spelling of 20851610486424 in words is "twenty trillion, eight hundred fifty-one billion, six hundred ten million, four hundred eighty-six thousand, four hundred twenty-four".