20284766 has 4 divisors (see below), whose sum is σ = 30427152. Its totient is φ = 10142382.

The previous prime is 20284763. The next prime is 20284787. The reversal of 20284766 is 66748202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66748202 = 2 ⋅33374101.

It is a super-2 number, since 2×20284766² = 822943463349512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20284763) 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 as a sum of consecutive naturals, namely, 5071190 + ... + 5071193.

It is an arithmetic number, because the mean of its divisors is an integer number (7606788).

Almost surely, 2^20284766 is an apocalyptic number.

20284766 is a deficient number, since it is larger than the sum of its proper divisors (10142386).

20284766 is a wasteful number, since it uses less digits than its factorization.

20284766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10142385.

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 20284766 is about 4503.8612323206. The cubic root of 20284766 is about 272.7239849637.

The spelling of 20284766 in words is "twenty million, two hundred eighty-four thousand, seven hundred sixty-six".