20512129 has 4 divisors (see below), whose sum is σ = 22376880. Its totient is φ = 18647380.

The previous prime is 20512087. The next prime is 20512139. The reversal of 20512129 is 92121502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20512129 - 2¹³ = 20503937 is a prime.

It is a super-2 number, since 2×20512129² = 841494872225282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20512139) 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 3 ways as a sum of consecutive naturals, for example, 932359 + ... + 932380.

It is an arithmetic number, because the mean of its divisors is an integer number (5594220).

Almost surely, 2^20512129 is an apocalyptic number.

It is an amenable number.

20512129 is a deficient number, since it is larger than the sum of its proper divisors (1864751).

20512129 is a wasteful number, since it uses less digits than its factorization.

20512129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1864750.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 20512129 is about 4529.0317949867. The cubic root of 20512129 is about 273.7391491567.

The spelling of 20512129 in words is "twenty million, five hundred twelve thousand, one hundred twenty-nine".