20508318 has 24 divisors (see below), whose sum is σ = 46367568. Its totient is φ = 6538752.

The previous prime is 20508317. The next prime is 20508349. The reversal of 20508318 is 81380502.

It is a happy number.

It is a super-2 number, since 2×20508318² = 841182214378248, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20508291 and 20508300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20508317) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24355 + ... + 25182.

It is an arithmetic number, because the mean of its divisors is an integer number (1931982).

Almost surely, 2^20508318 is an apocalyptic number.

20508318 is an abundant number, since it is smaller than the sum of its proper divisors (25859250).

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

20508318 is a wasteful number, since it uses less digits than its factorization.

20508318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49568 (or 49565 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 20508318 is about 4528.6110453427. The cubic root of 20508318 is about 273.7221952119.

The spelling of 20508318 in words is "twenty million, five hundred eight thousand, three hundred eighteen".