20908408 has 16 divisors (see below), whose sum is σ = 39253680. Its totient is φ = 10440768.

The previous prime is 20908399. The next prime is 20908409. The reversal of 20908408 is 80480902.

It is a self number, because there is not a number n which added to its sum of digits gives 20908408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20908409) 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, 8716 + ... + 10852.

It is an arithmetic number, because the mean of its divisors is an integer number (2453355).

Almost surely, 2^20908408 is an apocalyptic number.

It is an amenable number.

20908408 is a deficient number, since it is larger than the sum of its proper divisors (18345272).

20908408 is a wasteful number, since it uses less digits than its factorization.

20908408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3366 (or 3362 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 20908408 is about 4572.5712678973. The cubic root of 20908408 is about 275.4907292970.

It can be divided in two parts, 20908 and 408, that added together give a square (21316 = 146²).

The spelling of 20908408 in words is "twenty million, nine hundred eight thousand, four hundred eight".