20670818 has 16 divisors (see below), whose sum is σ = 35864640. Its totient is φ = 8751696.

The previous prime is 20670817. The next prime is 20670851. The reversal of 20670818 is 81807602.

It is not an unprimeable number, because it can be changed into a prime (20670817) by changing a digit.

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, 7733 + ... + 10056.

It is an arithmetic number, because the mean of its divisors is an integer number (2241540).

Almost surely, 2^20670818 is an apocalyptic number.

20670818 is a deficient number, since it is larger than the sum of its proper divisors (15193822).

20670818 is a wasteful number, since it uses less digits than its factorization.

20670818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17881.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 20670818 is about 4546.5171285282. The cubic root of 20670818 is about 274.4432504563.

The spelling of 20670818 in words is "twenty million, six hundred seventy thousand, eight hundred eighteen".