20055557563600 has 120 divisors (see below), whose sum is σ = 51902631156152. Its totient is φ = 7403311872000.

The previous prime is 20055557563537. The next prime is 20055557563603. The reversal of 20055557563600 is 636575555002.

It can be written as a sum of positive squares in 12 ways, for example, as 5666189901376 + 14389367662224 = 2380376^2 + 3793332^2 .

It is a super-3 number, since 3×20055557563600³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20055557563603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20812450 + ... + 21754750.

Almost surely, 2^{20055557563600} is an apocalyptic number.

20055557563600 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 20055557563600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25951315578076).

20055557563600 is an abundant number, since it is smaller than the sum of its proper divisors (31847073592552).

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

20055557563600 is a wasteful number, since it uses less digits than its factorization.

20055557563600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946425 (or 946414 counting only the distinct ones).

The product of its (nonzero) digits is 4725000, while the sum is 49.

The spelling of 20055557563600 in words is "twenty trillion, fifty-five billion, five hundred fifty-seven million, five hundred sixty-three thousand, six hundred".