20897055021600 has 504 divisors, whose sum is σ = 76559852324592. Its totient is φ = 5567270745600.

The previous prime is 20897055021553. The next prime is 20897055021613. The reversal of 20897055021600 is 612055079802.

20897055021600 is a `hidden beast` number, since 2 + 0 + 8 + 9 + 70 + 550 + 21 + 6 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 636254779 + ... + 636287621.

It is an arithmetic number, because the mean of its divisors is an integer number (151904468898).

Almost surely, 2^{20897055021600} is an apocalyptic number.

20897055021600 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 20897055021600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38279926162296).

20897055021600 is an abundant number, since it is smaller than the sum of its proper divisors (55662797302992).

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

20897055021600 is a wasteful number, since it uses less digits than its factorization.

20897055021600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33972 (or 33944 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 20897055021600 in words is "twenty trillion, eight hundred ninety-seven billion, fifty-five million, twenty-one thousand, six hundred".