20284438 has 8 divisors (see below), whose sum is σ = 32028120. Its totient is φ = 9608400.

The previous prime is 20284421. The next prime is 20284441. The reversal of 20284438 is 83448202.

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

It is a super-2 number, since 2×20284438² = 822916849951688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266863 + ... + 266938.

It is an arithmetic number, because the mean of its divisors is an integer number (4003515).

Almost surely, 2^20284438 is an apocalyptic number.

20284438 is a deficient number, since it is larger than the sum of its proper divisors (11743682).

20284438 is a wasteful number, since it uses less digits than its factorization.

20284438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533822.

The product of its (nonzero) digits is 12288, while the sum is 31.

The square root of 20284438 is about 4503.8248189733. The cubic root of 20284438 is about 272.7225149944.

The spelling of 20284438 in words is "twenty million, two hundred eighty-four thousand, four hundred thirty-eight".