20286641 has 4 divisors (see below), whose sum is σ = 20296692. Its totient is φ = 20276592.

The previous prime is 20286613. The next prime is 20286653. The reversal of 20286641 is 14668202.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 14899600 + 5387041 = 3860^2 + 2321^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20286641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20286601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 830 + ... + 6423.

It is an arithmetic number, because the mean of its divisors is an integer number (5074173).

Almost surely, 2^20286641 is an apocalyptic number.

It is an amenable number.

20286641 is a deficient number, since it is larger than the sum of its proper divisors (10051).

20286641 is an equidigital number, since it uses as much as digits as its factorization.

20286641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10050.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 20286641 is about 4504.0693822365. The cubic root of 20286641 is about 272.7323876852.

The spelling of 20286641 in words is "twenty million, two hundred eighty-six thousand, six hundred forty-one".