20284769 has 8 divisors (see below), whose sum is σ = 20960040. Its totient is φ = 19616256.

The previous prime is 20284763. The next prime is 20284787. The reversal of 20284769 is 96748202.

It can be written as a sum of positive squares in 4 ways, for example, as 15054400 + 5230369 = 3880^2 + 2287^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20284769 is a prime.

It is a super-2 number, since 2×20284769² = 822943706766722, which contains 22 as substring.

It is a Duffinian 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4817 + ... + 7985.

It is an arithmetic number, because the mean of its divisors is an integer number (2620005).

Almost surely, 2^20284769 is an apocalyptic number.

It is an amenable number.

20284769 is a deficient number, since it is larger than the sum of its proper divisors (675271).

20284769 is a wasteful number, since it uses less digits than its factorization.

20284769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3379.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 20284769 is about 4503.8615653681. The cubic root of 20284769 is about 272.7239984085.

The spelling of 20284769 in words is "twenty million, two hundred eighty-four thousand, seven hundred sixty-nine".