20591340 has 96 divisors (see below), whose sum is σ = 71898624. Its totient is φ = 4277760.

The previous prime is 20591339. The next prime is 20591341. The reversal of 20591340 is 4319502.

It is an interprime number because it is at equal distance from previous prime (20591339) and next prime (20591341).

It is a self number, because there is not a number n which added to its sum of digits gives 20591340.

It is not an unprimeable number, because it can be changed into a prime (20591341) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 2392 + ... + 6848.

It is an arithmetic number, because the mean of its divisors is an integer number (748944).

Almost surely, 2^20591340 is an apocalyptic number.

20591340 is a gapful number since it is divisible by the number (20) 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 20591340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35949312).

20591340 is an abundant number, since it is smaller than the sum of its proper divisors (51307284).

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

20591340 is a wasteful number, since it uses less digits than its factorization.

20591340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4487 (or 4485 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 20591340 is about 4537.7681738934. The cubic root of 20591340 is about 274.0910596522.

The spelling of 20591340 in words is "twenty million, five hundred ninety-one thousand, three hundred forty".