20140681 has 4 divisors (see below), whose sum is σ = 21971664. Its totient is φ = 18309700.

The previous prime is 20140667. The next prime is 20140739. The reversal of 20140681 is 18604102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20140681 - 2¹¹ = 20138633 is a prime.

It is a super-2 number, since 2×20140681² = 811294062287522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20146681) 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 3 ways as a sum of consecutive naturals, for example, 915475 + ... + 915496.

It is an arithmetic number, because the mean of its divisors is an integer number (5492916).

Almost surely, 2^20140681 is an apocalyptic number.

It is an amenable number.

20140681 is a deficient number, since it is larger than the sum of its proper divisors (1830983).

20140681 is a wasteful number, since it uses less digits than its factorization.

20140681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830982.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 20140681 is about 4487.8370068442. The cubic root of 20140681 is about 272.0767201764.

Adding to 20140681 its reverse (18604102), we get a palindrome (38744783).

The spelling of 20140681 in words is "twenty million, one hundred forty thousand, six hundred eighty-one".