20109429 has 24 divisors (see below), whose sum is σ = 31911360. Its totient is φ = 12146112.

The previous prime is 20109413. The next prime is 20109431. The reversal of 20109429 is 92490102.

It is not a de Polignac number, because 20109429 - 2⁴ = 20109413 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 (20109629) 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 23 ways as a sum of consecutive naturals, for example, 1377 + ... + 6489.

It is an arithmetic number, because the mean of its divisors is an integer number (1329640).

Almost surely, 2^20109429 is an apocalyptic number.

It is an amenable number.

20109429 is a deficient number, since it is larger than the sum of its proper divisors (11801931).

20109429 is a wasteful number, since it uses less digits than its factorization.

20109429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5161 (or 5158 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 20109429 is about 4484.3537996015. The cubic root of 20109429 is about 271.9359215043.

The spelling of 20109429 in words is "twenty million, one hundred nine thousand, four hundred twenty-nine".