20881332 has 36 divisors (see below), whose sum is σ = 55080480. Its totient is φ = 6657552.

The previous prime is 20881331. The next prime is 20881349. The reversal of 20881332 is 23318802.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 20881296 and 20881305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20881331) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11782 + ... + 13437.

Almost surely, 2^20881332 is an apocalyptic number.

It is an amenable number.

20881332 is an abundant number, since it is smaller than the sum of its proper divisors (34199148).

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

20881332 is a wasteful number, since it uses less digits than its factorization.

20881332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25252 (or 25247 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20881332 is about 4569.6096113344. The cubic root of 20881332 is about 275.3717594685.

The spelling of 20881332 in words is "twenty million, eight hundred eighty-one thousand, three hundred thirty-two".