20121029 has 8 divisors (see below), whose sum is σ = 20746368. Its totient is φ = 19504000.

The previous prime is 20120999. The next prime is 20121043. The reversal of 20121029 is 92012102.

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

It is a cyclic number.

It is not a de Polignac number, because 20121029 - 2⁸ = 20120773 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20120998 and 20121016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3029 + ... + 7029.

It is an arithmetic number, because the mean of its divisors is an integer number (2593296).

Almost surely, 2^20121029 is an apocalyptic number.

It is an amenable number.

20121029 is a deficient number, since it is larger than the sum of its proper divisors (625339).

20121029 is a wasteful number, since it uses less digits than its factorization.

20121029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4155.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 20121029 is about 4485.6469990404. The cubic root of 20121029 is about 271.9881996394.

The spelling of 20121029 in words is "twenty million, one hundred twenty-one thousand, twenty-nine".