20109280 has 24 divisors (see below), whose sum is σ = 47508552. Its totient is φ = 8043648.

The previous prime is 20109263. The next prime is 20109293. The reversal of 20109280 is 8290102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62682 + ... + 63001.

It is an arithmetic number, because the mean of its divisors is an integer number (1979523).

Almost surely, 2^20109280 is an apocalyptic number.

20109280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20109280 is an abundant number, since it is smaller than the sum of its proper divisors (27399272).

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

20109280 is a wasteful number, since it uses less digits than its factorization.

20109280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125698 (or 125690 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 20109280 is about 4484.3371862517. The cubic root of 20109280 is about 271.9352498699.

Adding to 20109280 its reverse (8290102), we get a palindrome (28399382).

The spelling of 20109280 in words is "twenty million, one hundred nine thousand, two hundred eighty".