20604280 has 32 divisors (see below), whose sum is σ = 47239200. Its totient is φ = 8085376.

The previous prime is 20604277. The next prime is 20604299. The reversal of 20604280 is 8240602.

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, 2740 + ... + 6979.

It is an arithmetic number, because the mean of its divisors is an integer number (1476225).

Almost surely, 2^20604280 is an apocalyptic number.

20604280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20604280 is an abundant number, since it is smaller than the sum of its proper divisors (26634920).

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

20604280 is a wasteful number, since it uses less digits than its factorization.

20604280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9783 (or 9779 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 20604280 is about 4539.1937610109. The cubic root of 20604280 is about 274.1484623536.

Adding to 20604280 its reverse (8240602), we get a palindrome (28844882).

The spelling of 20604280 in words is "twenty million, six hundred four thousand, two hundred eighty".