20986228 has 12 divisors (see below), whose sum is σ = 38886372. Its totient is φ = 9875840.

The previous prime is 20986181. The next prime is 20986237. The reversal of 20986228 is 82268902.

It can be written as a sum of positive squares in 2 ways, for example, as 9412624 + 11573604 = 3068^2 + 3402^2 .

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, 154243 + ... + 154378.

It is an arithmetic number, because the mean of its divisors is an integer number (3240531).

Almost surely, 2^20986228 is an apocalyptic number.

It is an amenable number.

20986228 is a deficient number, since it is larger than the sum of its proper divisors (17900144).

20986228 is a wasteful number, since it uses less digits than its factorization.

20986228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308642 (or 308640 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 20986228 is about 4581.0728001201. The cubic root of 20986228 is about 275.8320934908.

The spelling of 20986228 in words is "twenty million, nine hundred eighty-six thousand, two hundred twenty-eight".