20555734144 has 128 divisors (see below), whose sum is σ = 47423880000. Its totient is φ = 8771174400.

The previous prime is 20555734109. The next prime is 20555734159. The reversal of 20555734144 is 44143755502.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 20555734097 and 20555734106.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11943204 + ... + 11944924.

Almost surely, 2^20555734144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20555734144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23711940000).

20555734144 is an abundant number, since it is smaller than the sum of its proper divisors (26868145856).

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

20555734144 is a wasteful number, since it uses less digits than its factorization.

20555734144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2262 (or 2250 counting only the distinct ones).

The product of its (nonzero) digits is 336000, while the sum is 40.

The spelling of 20555734144 in words is "twenty billion, five hundred fifty-five million, seven hundred thirty-four thousand, one hundred forty-four".