20730129 has 16 divisors (see below), whose sum is σ = 31669248. Its totient is φ = 11815632.

The previous prime is 20730119. The next prime is 20730131. The reversal of 20730129 is 92103702.

It is not a de Polignac number, because 20730129 - 2⁸ = 20729873 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20730099 and 20730108.

It is not an unprimeable number, because it can be changed into a prime (20730109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9214 + ... + 11240.

It is an arithmetic number, because the mean of its divisors is an integer number (1979328).

Almost surely, 2^20730129 is an apocalyptic number.

It is an amenable number.

20730129 is a deficient number, since it is larger than the sum of its proper divisors (10939119).

20730129 is a wasteful number, since it uses less digits than its factorization.

20730129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2524.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 20730129 is about 4553.0351415292. The cubic root of 20730129 is about 274.7054874578.

The spelling of 20730129 in words is "twenty million, seven hundred thirty thousand, one hundred twenty-nine".