20286137 has 4 divisors (see below), whose sum is σ = 20295156. Its totient is φ = 20277120.

The previous prime is 20286131. The next prime is 20286139. The reversal of 20286137 is 73168202.

It is a happy number.

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 10916416 + 9369721 = 3304^2 + 3061^2 .

It is a cyclic number.

It is not a de Polignac number, because 20286137 - 2⁶ = 20286073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20286131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1937 + ... + 6657.

It is an arithmetic number, because the mean of its divisors is an integer number (5073789).

Almost surely, 2^20286137 is an apocalyptic number.

It is an amenable number.

20286137 is a deficient number, since it is larger than the sum of its proper divisors (9019).

20286137 is an equidigital number, since it uses as much as digits as its factorization.

20286137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9018.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 20286137 is about 4504.0134324844. The cubic root of 20286137 is about 272.7301290846.

The spelling of 20286137 in words is "twenty million, two hundred eighty-six thousand, one hundred thirty-seven".