20805130 has 16 divisors (see below), whose sum is σ = 37977984. Its totient is φ = 8204560.

The previous prime is 20805121. The next prime is 20805167. The reversal of 20805130 is 3150802.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20805098 and 20805107.

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, 13942 + ... + 15361.

It is an arithmetic number, because the mean of its divisors is an integer number (2373624).

Almost surely, 2^20805130 is an apocalyptic number.

20805130 is a deficient number, since it is larger than the sum of its proper divisors (17172854).

20805130 is a wasteful number, since it uses less digits than its factorization.

20805130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29381.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 20805130 is about 4561.2640791781. The cubic root of 20805130 is about 275.0363808617.

Adding to 20805130 its reverse (3150802), we get a palindrome (23955932).

The spelling of 20805130 in words is "twenty million, eight hundred five thousand, one hundred thirty".