20284808 has 16 divisors (see below), whose sum is σ = 40271580. Its totient is φ = 9545728.

The previous prime is 20284793. The next prime is 20284813. The reversal of 20284808 is 80848202.

It can be written as a sum of positive squares in 2 ways, for example, as 20052484 + 232324 = 4478^2 + 482^2 .

It is a super-2 number, since 2×20284808² = 822946871193728, 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, 74441 + ... + 74712.

Almost surely, 2^20284808 is an apocalyptic number.

It is an amenable number.

20284808 is a deficient number, since it is larger than the sum of its proper divisors (19986772).

20284808 is a wasteful number, since it uses less digits than its factorization.

20284808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149176 (or 149172 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 32.

The square root of 20284808 is about 4503.8658949840. The cubic root of 20284808 is about 272.7241731904.

The spelling of 20284808 in words is "twenty million, two hundred eighty-four thousand, eight hundred eight".