20289136 has 40 divisors (see below), whose sum is σ = 45855200. Its totient is φ = 8692992.

The previous prime is 20289103. The next prime is 20289167. The reversal of 20289136 is 63198202.

It is a junction number, because it is equal to n+sod(n) for n = 20289098 and 20289107.

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, 3640 + ... + 7336.

It is an arithmetic number, because the mean of its divisors is an integer number (1146380).

Almost surely, 2^20289136 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 20289136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22927600).

20289136 is an abundant number, since it is smaller than the sum of its proper divisors (25566064).

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

20289136 is an equidigital number, since it uses as much as digits as its factorization.

20289136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3726 (or 3706 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 20289136 is about 4504.3463454757. The cubic root of 20289136 is about 272.7435681038.

The spelling of 20289136 in words is "twenty million, two hundred eighty-nine thousand, one hundred thirty-six".