20284405 has 8 divisors (see below), whose sum is σ = 24406200. Its totient is φ = 16184256.

The previous prime is 20284403. The next prime is 20284421. The reversal of 20284405 is 50448202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5121169 + 15163236 = 2263^2 + 3894^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20284405 - 2¹ = 20284403 is a prime.

It is a super-2 number, since 2×20284405² = 822914172408050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20284405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20284403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3270 + ... + 7159.

It is an arithmetic number, because the mean of its divisors is an integer number (3050775).

Almost surely, 2^20284405 is an apocalyptic number.

It is an amenable number.

20284405 is a deficient number, since it is larger than the sum of its proper divisors (4121795).

20284405 is a wasteful number, since it uses less digits than its factorization.

20284405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10823.

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 20284405 is about 4503.8211554190. The cubic root of 20284405 is about 272.7223671003.

The spelling of 20284405 in words is "twenty million, two hundred eighty-four thousand, four hundred five".