20284878 has 8 divisors (see below), whose sum is σ = 40569768. Its totient is φ = 6761624.

The previous prime is 20284841. The next prime is 20284883. The reversal of 20284878 is 87848202.

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

20284878 is an admirable number.

It is a super-2 number, since 2×20284878² = 822952550949768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1690401 + ... + 1690412.

It is an arithmetic number, because the mean of its divisors is an integer number (5071221).

Almost surely, 2^20284878 is an apocalyptic number.

20284878 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.

20284878 is a wasteful number, since it uses less digits than its factorization.

20284878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3380818.

The product of its (nonzero) digits is 57344, while the sum is 39.

The square root of 20284878 is about 4503.8736660790. The cubic root of 20284878 is about 272.7244869008.

The spelling of 20284878 in words is "twenty million, two hundred eighty-four thousand, eight hundred seventy-eight".