20842286 has 4 divisors (see below), whose sum is σ = 31263432. Its totient is φ = 10421142.

The previous prime is 20842279. The next prime is 20842319. The reversal of 20842286 is 68224802.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

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, 5210570 + ... + 5210573.

It is an arithmetic number, because the mean of its divisors is an integer number (7815858).

Almost surely, 2^20842286 is an apocalyptic number.

20842286 is a deficient number, since it is larger than the sum of its proper divisors (10421146).

20842286 is a wasteful number, since it uses less digits than its factorization.

20842286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10421145.

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 20842286 is about 4565.3352560354. The cubic root of 20842286 is about 275.2000131687.

The spelling of 20842286 in words is "twenty million, eight hundred forty-two thousand, two hundred eighty-six".