20831429 has 16 divisors (see below), whose sum is σ = 22579200.
Its totient is φ = 19160064.
The previous prime is 20831323. The next prime is 20831533. The reversal of 20831429 is 92413802.
It is a cyclic number.
It is not a de Polignac number, because 20831429 - 216 = 20765893 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20831729) 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, 163964 + ... + 164090.
It is an arithmetic number, because the mean of its divisors is an integer number (1411200).
Almost surely, 220831429 is an apocalyptic number.
It is an amenable number.
20831429 is a deficient number, since it is larger than the sum of its proper divisors (1747771).
20831429 is a wasteful number, since it uses less digits than its factorization.
20831429 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 332.
The product of its (nonzero) digits is 3456, while the sum is 29.
The square root of 20831429 is about 4564.1460318443.
The cubic root of 20831429 is about 275.1522198589.
The spelling of 20831429 in words is "twenty million, eight hundred thirty-one thousand, four hundred twenty-nine".