20881134 has 24 divisors (see below), whose sum is σ = 47904480. Its totient is φ = 6550848.

The previous prime is 20881123. The next prime is 20881141. The reversal of 20881134 is 43118802.

It is a junction number, because it is equal to n+sod(n) for n = 20881098 and 20881107.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33814 + ... + 34425.

It is an arithmetic number, because the mean of its divisors is an integer number (1996020).

Almost surely, 2^20881134 is an apocalyptic number.

20881134 is an abundant number, since it is smaller than the sum of its proper divisors (27023346).

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

20881134 is a wasteful number, since it uses less digits than its factorization.

20881134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68264 (or 68261 counting only the distinct ones).

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

The square root of 20881134 is about 4569.5879464127. The cubic root of 20881134 is about 275.3708890933.

Adding to 20881134 its reverse (43118802), we get a palindrome (63999936).

The spelling of 20881134 in words is "twenty million, eight hundred eighty-one thousand, one hundred thirty-four".