20808030 has 16 divisors (see below), whose sum is σ = 49939344. Its totient is φ = 5548800.

The previous prime is 20808019. The next prime is 20808071. The reversal of 20808030 is 3080802.

It is a super-2 number, since 2×20808030² = 865948224961800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20807988 and 20808006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346771 + ... + 346830.

It is an arithmetic number, because the mean of its divisors is an integer number (3121209).

Almost surely, 2^20808030 is an apocalyptic number.

20808030 is an abundant number, since it is smaller than the sum of its proper divisors (29131314).

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

20808030 is a wasteful number, since it uses less digits than its factorization.

20808030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693611.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 20808030 is about 4561.5819624336. The cubic root of 20808030 is about 275.0491592558.

Adding to 20808030 its reverse (3080802), we get a palindrome (23888832).

The spelling of 20808030 in words is "twenty million, eight hundred eight thousand, thirty".