20808228 has 24 divisors (see below), whose sum is σ = 55488832. Its totient is φ = 5945184.

The previous prime is 20808107. The next prime is 20808233. The reversal of 20808228 is 82280802.

It is a junction number, because it is equal to n+sod(n) for n = 20808195 and 20808204.

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, 123775 + ... + 123942.

Almost surely, 2^20808228 is an apocalyptic number.

20808228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20808228 is an abundant number, since it is smaller than the sum of its proper divisors (34680604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20808228 is a wasteful number, since it uses less digits than its factorization.

20808228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247731 (or 247729 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 30.

The square root of 20808228 is about 4561.6036653791. The cubic root of 20808228 is about 275.0500316684.

The spelling of 20808228 in words is "twenty million, eight hundred eight thousand, two hundred twenty-eight".