20281135104 has 130 divisors (see below), whose sum is σ = 60586615430. Its totient is φ = 6760267776.

The previous prime is 20281135087. The next prime is 20281135117. The reversal of 20281135104 is 40153118202.

It can be written as a sum of positive squares in only one way, i.e., 12615782400 + 7665352704 = 112320^2 + 87552^2 .

It is a super-2 number, since 2×20281135104² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 301212 + ... + 362340.

Almost surely, 2^20281135104 is an apocalyptic number.

20281135104 is a gapful number since it is divisible by the number (24) 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 20281135104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30293307715).

20281135104 is an abundant number, since it is smaller than the sum of its proper divisors (40305480326).

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

20281135104 is an frugal number, since it uses more digits than its factorization.

20281135104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61165 (or 61134 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The spelling of 20281135104 in words is "twenty billion, two hundred eighty-one million, one hundred thirty-five thousand, one hundred four".