20129675 has 6 divisors (see below), whose sum is σ = 24960828. Its totient is φ = 16103720.

The previous prime is 20129671. The next prime is 20129687. The reversal of 20129675 is 57692102.

It is not a de Polignac number, because 20129675 - 2² = 20129671 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20129671) 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 5 ways as a sum of consecutive naturals, for example, 402569 + ... + 402618.

It is an arithmetic number, because the mean of its divisors is an integer number (4160138).

Almost surely, 2^20129675 is an apocalyptic number.

20129675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20129675 is a deficient number, since it is larger than the sum of its proper divisors (4831153).

20129675 is an equidigital number, since it uses as much as digits as its factorization.

20129675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805197 (or 805192 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 20129675 is about 4486.6106361038. The cubic root of 20129675 is about 272.0271518094.

The spelling of 20129675 in words is "twenty million, one hundred twenty-nine thousand, six hundred seventy-five".