20808234 has 12 divisors (see below), whose sum is σ = 45084546. Its totient is φ = 6936072.

The previous prime is 20808233. The next prime is 20808241. The reversal of 20808234 is 43280802.

It can be written as a sum of positive squares in only one way, i.e., 20223009 + 585225 = 4497^2 + 765^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20808198 and 20808207.

It is not an unprimeable number, because it can be changed into a prime (20808233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 577989 + ... + 578024.

Almost surely, 2^20808234 is an apocalyptic number.

20808234 is an abundant number, since it is smaller than the sum of its proper divisors (24276312).

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

20808234 is a wasteful number, since it uses less digits than its factorization.

20808234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156021 (or 1156018 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 20808234 is about 4561.6043230425. The cubic root of 20808234 is about 275.0500581050.

The spelling of 20808234 in words is "twenty million, eight hundred eight thousand, two hundred thirty-four".