20881012 has 12 divisors (see below), whose sum is σ = 36761760. Its totient is φ = 10377656.

The previous prime is 20881001. The next prime is 20881027. The reversal of 20881012 is 21018802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14962 + ... + 16297.

It is an arithmetic number, because the mean of its divisors is an integer number (3063480).

Almost surely, 2^20881012 is an apocalyptic number.

It is an amenable number.

20881012 is a deficient number, since it is larger than the sum of its proper divisors (15880748).

20881012 is a wasteful number, since it uses less digits than its factorization.

20881012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31430 (or 31428 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 20881012 is about 4569.5745972683. The cubic root of 20881012 is about 275.3703527987.

Adding to 20881012 its reverse (21018802), we get a palindrome (41899814).

The spelling of 20881012 in words is "twenty million, eight hundred eighty-one thousand, twelve".