20280208 has 20 divisors (see below), whose sum is σ = 42315868. Its totient is φ = 9360000.

The previous prime is 20280191. The next prime is 20280217. The reversal of 20280208 is 80208202.

It can be written as a sum of positive squares in 2 ways, for example, as 8225424 + 12054784 = 2868^2 + 3472^2 .

It is a super-2 number, since 2×20280208² = 822573673046528, which contains 22 as substring.

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, 48543 + ... + 48958.

Almost surely, 2^20280208 is an apocalyptic number.

It is an amenable number.

20280208 is an abundant number, since it is smaller than the sum of its proper divisors (22035660).

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

20280208 is a wasteful number, since it uses less digits than its factorization.

20280208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97522 (or 97516 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 20280208 is about 4503.3551936306. The cubic root of 20280208 is about 272.7035563485.

The spelling of 20280208 in words is "twenty million, two hundred eighty thousand, two hundred eight".