20129908 has 12 divisors (see below), whose sum is σ = 35570080. Its totient is φ = 9967032.

The previous prime is 20129897. The next prime is 20129909. The reversal of 20129908 is 80992102.

It is a self number, because there is not a number n which added to its sum of digits gives 20129908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20129909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24018 + ... + 24841.

Almost surely, 2^20129908 is an apocalyptic number.

It is an amenable number.

20129908 is a deficient number, since it is larger than the sum of its proper divisors (15440172).

20129908 is a wasteful number, since it uses less digits than its factorization.

20129908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48966 (or 48964 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 20129908 is about 4486.6366021776. The cubic root of 20129908 is about 272.0282013724.

The spelling of 20129908 in words is "twenty million, one hundred twenty-nine thousand, nine hundred eight".