20284447 has 8 divisors (see below), whose sum is σ = 20990592. Its totient is φ = 19581600.

The previous prime is 20284441. The next prime is 20284469. The reversal of 20284447 is 74448202.

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 20284447 - 2¹¹ = 20282399 is a prime.

It is a super-2 number, since 2×20284447² = 822917580191618, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20284441) 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, 24297 + ... + 25117.

It is an arithmetic number, because the mean of its divisors is an integer number (2623824).

Almost surely, 2^20284447 is an apocalyptic number.

20284447 is a deficient number, since it is larger than the sum of its proper divisors (706145).

20284447 is an equidigital number, since it uses as much as digits as its factorization.

20284447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1649.

The product of its (nonzero) digits is 14336, while the sum is 31.

The square root of 20284447 is about 4503.8258181240. The cubic root of 20284447 is about 272.7225553292.

The spelling of 20284447 in words is "twenty million, two hundred eighty-four thousand, four hundred forty-seven".