20286645 has 8 divisors (see below), whose sum is σ = 32458656. Its totient is φ = 10819536.

The previous prime is 20286613. The next prime is 20286653. The reversal of 20286645 is 54668202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20286645 - 2⁵ = 20286613 is a prime.

It is a super-3 number, since 3×20286645³ (a number of 23 digits) contains 333 as substring.

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 in 7 ways as a sum of consecutive naturals, for example, 676207 + ... + 676236.

It is an arithmetic number, because the mean of its divisors is an integer number (4057332).

Almost surely, 2^20286645 is an apocalyptic number.

It is an amenable number.

20286645 is a deficient number, since it is larger than the sum of its proper divisors (12172011).

20286645 is a wasteful number, since it uses less digits than its factorization.

20286645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1352451.

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 20286645 is about 4504.0698262793. The cubic root of 20286645 is about 272.7324056105.

The spelling of 20286645 in words is "twenty million, two hundred eighty-six thousand, six hundred forty-five".