20881316 has 12 divisors (see below), whose sum is σ = 37392432. Its totient is φ = 10197768.

The previous prime is 20881303. The next prime is 20881319. The reversal of 20881316 is 61318802.

It is not an unprimeable number, because it can be changed into a prime (20881319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60530 + ... + 60873.

It is an arithmetic number, because the mean of its divisors is an integer number (3116036).

Almost surely, 2^20881316 is an apocalyptic number.

It is an amenable number.

20881316 is a deficient number, since it is larger than the sum of its proper divisors (16511116).

20881316 is a wasteful number, since it uses less digits than its factorization.

20881316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121450 (or 121448 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 20881316 is about 4569.6078606375. The cubic root of 20881316 is about 275.3716891353.

The spelling of 20881316 in words is "twenty million, eight hundred eighty-one thousand, three hundred sixteen".