20405141 has 2 divisors, whose sum is σ = 20405142. Its totient is φ = 20405140.

The previous prime is 20405137. The next prime is 20405153. The reversal of 20405141 is 14150402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16982641 + 3422500 = 4121^2 + 1850^2 .

It is a cyclic number.

It is not a de Polignac number, because 20405141 - 2² = 20405137 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20405101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202570 + 10202571.

It is an arithmetic number, because the mean of its divisors is an integer number (10202571).

Almost surely, 2^20405141 is an apocalyptic number.

It is an amenable number.

20405141 is a deficient number, since it is larger than the sum of its proper divisors (1).

20405141 is an equidigital number, since it uses as much as digits as its factorization.

20405141 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 20405141 is about 4517.2049986690. The cubic root of 20405141 is about 273.2623926876.

Adding to 20405141 its reverse (14150402), we get a palindrome (34555543).

The spelling of 20405141 in words is "twenty million, four hundred five thousand, one hundred forty-one".