20881532 has 24 divisors (see below), whose sum is σ = 43962240. Its totient is φ = 8478000.

The previous prime is 20881529. The next prime is 20881561. The reversal of 20881532 is 23518802.

It is a junction number, because it is equal to n+sod(n) for n = 20881495 and 20881504.

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 7 ways as a sum of consecutive naturals, for example, 19094 + ... + 20157.

It is an arithmetic number, because the mean of its divisors is an integer number (1831760).

Almost surely, 2^20881532 is an apocalyptic number.

It is an amenable number.

20881532 is an abundant number, since it is smaller than the sum of its proper divisors (23080708).

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

20881532 is a wasteful number, since it uses less digits than its factorization.

20881532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39281 (or 39279 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 20881532 is about 4569.6314949895. The cubic root of 20881532 is about 275.3726386298.

The spelling of 20881532 in words is "twenty million, eight hundred eighty-one thousand, five hundred thirty-two".