20140581 has 8 divisors (see below), whose sum is σ = 27425664. Its totient is φ = 13141280.

The previous prime is 20140573. The next prime is 20140609. The reversal of 20140581 is 18504102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20140581 - 2³ = 20140573 is a prime.

It is a super-2 number, since 2×20140581² = 811286006035122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20145581) 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, 71280 + ... + 71561.

It is an arithmetic number, because the mean of its divisors is an integer number (3428208).

Almost surely, 2^20140581 is an apocalyptic number.

It is an amenable number.

20140581 is a deficient number, since it is larger than the sum of its proper divisors (7285083).

20140581 is a wasteful number, since it uses less digits than its factorization.

20140581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142891.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 20140581 is about 4487.8258656058. The cubic root of 20140581 is about 272.0762698818.

Adding to 20140581 its reverse (18504102), we get a palindrome (38644683).

The spelling of 20140581 in words is "twenty million, one hundred forty thousand, five hundred eighty-one".