20129741 has 8 divisors (see below), whose sum is σ = 21077280. Its totient is φ = 19199152.

The previous prime is 20129713. The next prime is 20129743. The reversal of 20129741 is 14792102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20129741 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20129741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20129743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1775 + ... + 6588.

It is an arithmetic number, because the mean of its divisors is an integer number (2634660).

Almost surely, 2^20129741 is an apocalyptic number.

It is an amenable number.

20129741 is a deficient number, since it is larger than the sum of its proper divisors (947539).

20129741 is an equidigital number, since it uses as much as digits as its factorization.

20129741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8475.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 20129741 is about 4486.6179913160. The cubic root of 20129741 is about 272.0274491113.

The spelling of 20129741 in words is "twenty million, one hundred twenty-nine thousand, seven hundred forty-one".