20881307228 has 24 divisors (see below), whose sum is σ = 37741600512. Its totient is φ = 10102531824.

The previous prime is 20881307201. The next prime is 20881307231. The reversal of 20881307228 is 82270318802.

It is a happy number.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 548900 + ... + 585707.

It is an arithmetic number, because the mean of its divisors is an integer number (1572566688).

Almost surely, 2^20881307228 is an apocalyptic number.

It is an amenable number.

20881307228 is a deficient number, since it is larger than the sum of its proper divisors (16860293284).

20881307228 is a wasteful number, since it uses less digits than its factorization.

20881307228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134761 (or 1134759 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 41.

The spelling of 20881307228 in words is "twenty billion, eight hundred eighty-one million, three hundred seven thousand, two hundred twenty-eight".