20286890 has 32 divisors (see below), whose sum is σ = 39702096. Its totient is φ = 7418880.

The previous prime is 20286887. The next prime is 20286907. The reversal of 20286890 is 9868202.

It can be written as a sum of positive squares in 8 ways, for example, as 582169 + 19704721 = 763^2 + 4439^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20286890.

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 in 15 ways as a sum of consecutive naturals, for example, 14000 + ... + 15380.

Almost surely, 2^20286890 is an apocalyptic number.

20286890 is a deficient number, since it is larger than the sum of its proper divisors (19415206).

20286890 is a wasteful number, since it uses less digits than its factorization.

20286890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1514.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 20286890 is about 4504.0970238218. The cubic root of 20286890 is about 272.7335035277.

The spelling of 20286890 in words is "twenty million, two hundred eighty-six thousand, eight hundred ninety".