20091136 has 36 divisors (see below), whose sum is σ = 43195852. Its totient is φ = 9271296.

The previous prime is 20091119. The next prime is 20091163. The reversal of 20091136 is 63119002.

It can be written as a sum of positive squares in 2 ways, for example, as 3444736 + 16646400 = 1856^2 + 4080^2 .

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310 + ... + 6346.

Almost surely, 2^20091136 is an apocalyptic number.

20091136 is a gapful number since it is divisible by the number (26) 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 20091136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21597926).

20091136 is an abundant number, since it is smaller than the sum of its proper divisors (23104716).

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

20091136 is an equidigital number, since it uses as much as digits as its factorization.

20091136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6066 (or 6052 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 20091136 is about 4482.3136882641. The cubic root of 20091136 is about 271.8534389208.

The spelling of 20091136 in words is "twenty million, ninety-one thousand, one hundred thirty-six".