20016551533500 has 384 divisors, whose sum is σ = 65766246174720. Its totient is φ = 5255284320000.

The previous prime is 20016551533499. The next prime is 20016551533541. The reversal of 20016551533500 is 533515561002.

20016551533500 is a `hidden beast` number, since 2 + 0 + 0 + 1 + 6 + 551 + 53 + 3 + 50 + 0 = 666.

It is a super-2 number, since 2×20016551533500² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2126474794 + ... + 2126484206.

It is an arithmetic number, because the mean of its divisors is an integer number (171266266080).

Almost surely, 2^{20016551533500} is an apocalyptic number.

20016551533500 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 20016551533500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32883123087360).

20016551533500 is an abundant number, since it is smaller than the sum of its proper divisors (45749694641220).

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

20016551533500 is a wasteful number, since it uses less digits than its factorization.

20016551533500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11859 (or 11841 counting only the distinct ones).

The product of its (nonzero) digits is 67500, while the sum is 36.

The spelling of 20016551533500 in words is "twenty trillion, sixteen billion, five hundred fifty-one million, five hundred thirty-three thousand, five hundred".