20662228 has 6 divisors (see below), whose sum is σ = 36158906. Its totient is φ = 10331112.

The previous prime is 20662183. The next prime is 20662241. The reversal of 20662228 is 82226602.

It can be written as a sum of positive squares in only one way, i.e., 18507204 + 2155024 = 4302^2 + 1468^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20662196 and 20662205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2582775 + ... + 2582782.

Almost surely, 2^20662228 is an apocalyptic number.

It is an amenable number.

20662228 is a deficient number, since it is larger than the sum of its proper divisors (15496678).

20662228 is a wasteful number, since it uses less digits than its factorization.

20662228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5165561 (or 5165559 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 20662228 is about 4545.5723512007. The cubic root of 20662228 is about 274.4052291557.

The spelling of 20662228 in words is "twenty million, six hundred sixty-two thousand, two hundred twenty-eight".