20881542 has 64 divisors (see below), whose sum is σ = 49641984. Its totient is φ = 5783040.

The previous prime is 20881529. The next prime is 20881561. The reversal of 20881542 is 24518802.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 41263 + ... + 41765.

It is an arithmetic number, because the mean of its divisors is an integer number (775656).

Almost surely, 2^20881542 is an apocalyptic number.

20881542 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 20881542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24820992).

20881542 is an abundant number, since it is smaller than the sum of its proper divisors (28760442).

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

20881542 is a wasteful number, since it uses less digits than its factorization.

20881542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 20881542 is about 4569.6325891695. The cubic root of 20881542 is about 275.3726825877.

The spelling of 20881542 in words is "twenty million, eight hundred eighty-one thousand, five hundred forty-two".