20841138 has 96 divisors (see below), whose sum is σ = 51455040. Its totient is φ = 6298560.

The previous prime is 20841113. The next prime is 20841179. The reversal of 20841138 is 83114802.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 341628 + ... + 341688.

It is an arithmetic number, because the mean of its divisors is an integer number (535990).

Almost surely, 2^20841138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20841138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25727520).

20841138 is an abundant number, since it is smaller than the sum of its proper divisors (30613902).

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

20841138 is a wasteful number, since it uses less digits than its factorization.

20841138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 20841138 is about 4565.2095242168. The cubic root of 20841138 is about 275.1949603734.

The spelling of 20841138 in words is "twenty million, eight hundred forty-one thousand, one hundred thirty-eight".