20287741 has 2 divisors, whose sum is σ = 20287742. Its totient is φ = 20287740.

The previous prime is 20287739. The next prime is 20287777. The reversal of 20287741 is 14778202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14784025 + 5503716 = 3845^2 + 2346^2 .

It is a cyclic number.

It is not a de Polignac number, because 20287741 - 2¹ = 20287739 is a prime.

Together with 20287739, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20284741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10143870 + 10143871.

It is an arithmetic number, because the mean of its divisors is an integer number (10143871).

Almost surely, 2^20287741 is an apocalyptic number.

It is an amenable number.

20287741 is a deficient number, since it is larger than the sum of its proper divisors (1).

20287741 is an equidigital number, since it uses as much as digits as its factorization.

20287741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 20287741 is about 4504.1914923769. The cubic root of 20287741 is about 272.7373170408.

The spelling of 20287741 in words is "twenty million, two hundred eighty-seven thousand, seven hundred forty-one".