20281111320 has 32 divisors (see below), whose sum is σ = 60843334320. Its totient is φ = 5408296320.

The previous prime is 20281111313. The next prime is 20281111393. The reversal of 20281111320 is 2311118202.

It is a super-2 number, since 2×20281111320² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84504511 + ... + 84504750.

Almost surely, 2^20281111320 is an apocalyptic number.

20281111320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20281111320 is an abundant number, since it is smaller than the sum of its proper divisors (40562223000).

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

20281111320 is a wasteful number, since it uses less digits than its factorization.

20281111320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169009275 (or 169009271 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 20281111320 its reverse (2311118202), we get a palindrome (22592229522).

The spelling of 20281111320 in words is "twenty billion, two hundred eighty-one million, one hundred eleven thousand, three hundred twenty".