20908156 has 12 divisors (see below), whose sum is σ = 36967168. Its totient is φ = 10346112.

The previous prime is 20908141. The next prime is 20908157. The reversal of 20908156 is 65180902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20908157) 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 3 ways as a sum of consecutive naturals, for example, 26556 + ... + 27331.

Almost surely, 2^20908156 is an apocalyptic number.

It is an amenable number.

20908156 is a deficient number, since it is larger than the sum of its proper divisors (16059012).

20908156 is a wasteful number, since it uses less digits than its factorization.

20908156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53988 (or 53986 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 20908156 is about 4572.5437122022. The cubic root of 20908156 is about 275.4896225023.

The spelling of 20908156 in words is "twenty million, nine hundred eight thousand, one hundred fifty-six".