20591312 has 40 divisors (see below), whose sum is σ = 46026816. Its totient is φ = 8741376.

The previous prime is 20591303. The next prime is 20591317. The reversal of 20591312 is 21319502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20591317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11843 + ... + 13469.

Almost surely, 2^20591312 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 20591312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23013408).

20591312 is an abundant number, since it is smaller than the sum of its proper divisors (25435504).

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

20591312 is a wasteful number, since it uses less digits than its factorization.

20591312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1755 (or 1749 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 20591312 is about 4537.7650886753. The cubic root of 20591312 is about 274.0909354162.

The spelling of 20591312 in words is "twenty million, five hundred ninety-one thousand, three hundred twelve".