20284458 has 8 divisors (see below), whose sum is σ = 40568928. Its totient is φ = 6761484.

The previous prime is 20284441. The next prime is 20284469. The reversal of 20284458 is 85448202.

It is a happy number.

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

20284458 is an admirable number.

It is a super-2 number, since 2×20284458² = 822918472707528, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon 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, 1690366 + ... + 1690377.

It is an arithmetic number, because the mean of its divisors is an integer number (5071116).

Almost surely, 2^20284458 is an apocalyptic number.

20284458 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20284458 is a wasteful number, since it uses less digits than its factorization.

20284458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3380748.

The product of its (nonzero) digits is 20480, while the sum is 33.

The square root of 20284458 is about 4503.8270393078. The cubic root of 20284458 is about 272.7226046272.

The spelling of 20284458 in words is "twenty million, two hundred eighty-four thousand, four hundred fifty-eight".