20708818 has 8 divisors (see below), whose sum is σ = 33452748. Its totient is φ = 9557904.

The previous prime is 20708791. The next prime is 20708819. The reversal of 20708818 is 81880702.

It can be written as a sum of positive squares in 2 ways, for example, as 20223009 + 485809 = 4497^2 + 697^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20708819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398221 + ... + 398272.

Almost surely, 2^20708818 is an apocalyptic number.

20708818 is a deficient number, since it is larger than the sum of its proper divisors (12743930).

20708818 is a wasteful number, since it uses less digits than its factorization.

20708818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796508.

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 20708818 is about 4550.6942327517. The cubic root of 20708818 is about 274.6113208805.

The spelling of 20708818 in words is "twenty million, seven hundred eight thousand, eight hundred eighteen".