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20731141 = 22990529

20731141 has 4 divisors (see below), whose sum is σ = 20821900. Its totient is φ = 20640384.

The previous prime is 20731133. The next prime is 20731153. The reversal of 20731141 is 14113702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14113702 = 27056851.

It can be written as a sum of positive squares in 2 ways, for example, as 19838116 + 893025 = 4454^2 + 945^2 .

It is a cyclic number.

It is not a de Polignac number, because 20731141 - 23 = 20731133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20731121) 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, 45036 + ... + 45493.

It is an arithmetic number, because the mean of its divisors is an integer number (5205475).

Almost surely, 220731141 is an apocalyptic number.

It is an amenable number.

20731141 is a deficient number, since it is larger than the sum of its proper divisors (90759).

20731141 is an equidigital number, since it uses as much as digits as its factorization.

20731141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90758.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 20731141 is about 4553.1462748302. The cubic root of 20731141 is about 274.7099575607.

Adding to 20731141 its reverse (14113702), we get a palindrome (34844843).

The spelling of 20731141 in words is "twenty million, seven hundred thirty-one thousand, one hundred forty-one".

Divisors: 1 229 90529 20731141