20287282 has 4 divisors (see below), whose sum is σ = 30430926. Its totient is φ = 10143640.

The previous prime is 20287277. The next prime is 20287291. The reversal of 20287282 is 28278202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28278202 = 2 ⋅14139101.

It can be written as a sum of positive squares in only one way, i.e., 20151121 + 136161 = 4489^2 + 369^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5071819 + ... + 5071822.

Almost surely, 2^20287282 is an apocalyptic number.

20287282 is a deficient number, since it is larger than the sum of its proper divisors (10143644).

20287282 is a wasteful number, since it uses less digits than its factorization.

20287282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10143643.

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 20287282 is about 4504.1405395480. The cubic root of 20287282 is about 272.7352601768.

The spelling of 20287282 in words is "twenty million, two hundred eighty-seven thousand, two hundred eighty-two".