20281120 has 24 divisors (see below), whose sum is σ = 47914524. Its totient is φ = 8112384.

The previous prime is 20281091. The next prime is 20281123. The reversal of 20281120 is 2118202.

It can be written as a sum of positive squares in 2 ways, for example, as 19963024 + 318096 = 4468^2 + 564^2 .

It is a super-2 number, since 2×20281120² = 822647656908800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 20281094 and 20281103.

It is not an unprimeable number, because it can be changed into a prime (20281123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63219 + ... + 63538.

Almost surely, 2^20281120 is an apocalyptic number.

20281120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20281120 is an abundant number, since it is smaller than the sum of its proper divisors (27633404).

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

20281120 is a wasteful number, since it uses less digits than its factorization.

20281120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126772 (or 126764 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 20281120 is about 4503.4564503279. The cubic root of 20281120 is about 272.7076441092.

Adding to 20281120 its reverse (2118202), we get a palindrome (22399322).

The spelling of 20281120 in words is "twenty million, two hundred eighty-one thousand, one hundred twenty".