20055565600 has 144 divisors (see below), whose sum is σ = 56791240128. Its totient is φ = 6773437440.

The previous prime is 20055565571. The next prime is 20055565613. The reversal of 20055565600 is 656555002.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 348474 + ... + 401926.

It is an arithmetic number, because the mean of its divisors is an integer number (394383612).

Almost surely, 2^20055565600 is an apocalyptic number.

20055565600 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 20055565600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28395620064).

20055565600 is an abundant number, since it is smaller than the sum of its proper divisors (36735674528).

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

20055565600 is a wasteful number, since it uses less digits than its factorization.

20055565600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53547 (or 53534 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 34.

The spelling of 20055565600 in words is "twenty billion, fifty-five million, five hundred sixty-five thousand, six hundred".