20129613 has 8 divisors (see below), whose sum is σ = 30673728. Its totient is φ = 11502624.

The previous prime is 20129597. The next prime is 20129639. The reversal of 20129613 is 31692102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20129613 - 2⁴ = 20129597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20129653) 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, 479256 + ... + 479297.

It is an arithmetic number, because the mean of its divisors is an integer number (3834216).

Almost surely, 2^20129613 is an apocalyptic number.

It is an amenable number.

20129613 is a deficient number, since it is larger than the sum of its proper divisors (10544115).

20129613 is an equidigital number, since it uses as much as digits as its factorization.

20129613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958563.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 20129613 is about 4486.6037266512. The cubic root of 20129613 is about 272.0268725252.

The spelling of 20129613 in words is "twenty million, one hundred twenty-nine thousand, six hundred thirteen".