20554999517316 has 192 divisors, whose sum is σ = 55159899540480. Its totient is φ = 5899178288640.

The previous prime is 20554999517303. The next prime is 20554999517399. The reversal of 20554999517316 is 61371599945502.

It is a Harshad number since it is a multiple of its sum of digits (66).

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, 1182196375 + ... + 1182213761.

It is an arithmetic number, because the mean of its divisors is an integer number (287291143440).

Almost surely, 2^{20554999517316} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20554999517316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27579949770240).

20554999517316 is an abundant number, since it is smaller than the sum of its proper divisors (34604900023164).

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

20554999517316 is a wasteful number, since it uses less digits than its factorization.

20554999517316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23314 (or 23312 counting only the distinct ones).

The product of its (nonzero) digits is 91854000, while the sum is 66.

The spelling of 20554999517316 in words is "twenty trillion, five hundred fifty-four billion, nine hundred ninety-nine million, five hundred seventeen thousand, three hundred sixteen".