20308260 has 48 divisors (see below), whose sum is σ = 64987776. Its totient is φ = 4641792.

The previous prime is 20308259. The next prime is 20308273. The reversal of 20308260 is 6280302.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 23757 + ... + 24596.

It is an arithmetic number, because the mean of its divisors is an integer number (1353912).

Almost surely, 2^20308260 is an apocalyptic number.

20308260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20308260 is an abundant number, since it is smaller than the sum of its proper divisors (44679516).

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

20308260 is a wasteful number, since it uses less digits than its factorization.

20308260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48372 (or 48370 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20308260 is about 4506.4686840141. The cubic root of 20308260 is about 272.8292348049.

Adding to 20308260 its reverse (6280302), we get a palindrome (26588562).

The spelling of 20308260 in words is "twenty million, three hundred eight thousand, two hundred sixty".