20129727 has 8 divisors (see below), whose sum is σ = 26861440. Its totient is φ = 13408920.

The previous prime is 20129713. The next prime is 20129743. The reversal of 20129727 is 72792102.

It is a happy number.

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

It is not a de Polignac number, because 20129727 - 2⁶ = 20129663 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20129694 and 20129703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20129327) 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, 3852 + ... + 7422.

It is an arithmetic number, because the mean of its divisors is an integer number (3357680).

Almost surely, 2^20129727 is an apocalyptic number.

20129727 is a deficient number, since it is larger than the sum of its proper divisors (6731713).

20129727 is a wasteful number, since it uses less digits than its factorization.

20129727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5453.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 20129727 is about 4486.6164311204. The cubic root of 20129727 is about 272.0273860474.

The spelling of 20129727 in words is "twenty million, one hundred twenty-nine thousand, seven hundred twenty-seven".