20898091855872 has 1248 divisors, whose sum is σ = 77195234188800. Its totient is φ = 5399933091840.

The previous prime is 20898091855847. The next prime is 20898091855873. The reversal of 20898091855872 is 27855819089802.

20898091855872 is a `hidden beast` number, since 20 + 8 + 9 + 8 + 0 + 9 + 18 + 5 + 587 + 2 = 666.

It is a super-2 number, since 2×20898091855872² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 20898091855872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20898091855873) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 48263491368 + ... + 48263491800.

It is an arithmetic number, because the mean of its divisors is an integer number (61855155600).

Almost surely, 2^{20898091855872} is an apocalyptic number.

20898091855872 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 20898091855872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38597617094400).

20898091855872 is an abundant number, since it is smaller than the sum of its proper divisors (56297142332928).

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

20898091855872 is a wasteful number, since it uses less digits than its factorization.

20898091855872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842 (or 803 counting only the distinct ones).

The product of its (nonzero) digits is 232243200, while the sum is 72.

The spelling of 20898091855872 in words is "twenty trillion, eight hundred ninety-eight billion, ninety-one million, eight hundred fifty-five thousand, eight hundred seventy-two".