20306260 has 24 divisors (see below), whose sum is σ = 45923976. Its totient is φ = 7497600.

The previous prime is 20306257. The next prime is 20306291. The reversal of 20306260 is 6260302.

It can be written as a sum of positive squares in 4 ways, for example, as 2022084 + 18284176 = 1422^2 + 4276^2 .

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, 38791 + ... + 39310.

It is an arithmetic number, because the mean of its divisors is an integer number (1913499).

Almost surely, 2^20306260 is an apocalyptic number.

20306260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20306260 is an abundant number, since it is smaller than the sum of its proper divisors (25617716).

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

20306260 is a wasteful number, since it uses less digits than its factorization.

20306260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78123 (or 78121 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 20306260 is about 4506.2467753109. The cubic root of 20306260 is about 272.8202782460.

Adding to 20306260 its reverse (6260302), we get a palindrome (26566562).

The spelling of 20306260 in words is "twenty million, three hundred six thousand, two hundred sixty".