20884842 has 72 divisors (see below), whose sum is σ = 51123072. Its totient is φ = 6153840.

The previous prime is 20884837. The next prime is 20884847. The reversal of 20884842 is 24848802.

It is an interprime number because it is at equal distance from previous prime (20884837) and next prime (20884847).

It is a junction number, because it is equal to n+sod(n) for n = 20884797 and 20884806.

It is not an unprimeable number, because it can be changed into a prime (20884847) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 93543 + ... + 93765.

Almost surely, 2^20884842 is an apocalyptic number.

20884842 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20884842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25561536).

20884842 is an abundant number, since it is smaller than the sum of its proper divisors (30238230).

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

20884842 is a wasteful number, since it uses less digits than its factorization.

20884842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 36.

The square root of 20884842 is about 4569.9936542626. The cubic root of 20884842 is about 275.3871879339.

The spelling of 20884842 in words is "twenty million, eight hundred eighty-four thousand, eight hundred forty-two".