20121329 has 8 divisors (see below), whose sum is σ = 20539008. Its totient is φ = 19707520.

The previous prime is 20121307. The next prime is 20121337. The reversal of 20121329 is 92312102.

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 20121329 - 2²⁴ = 3344113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20121329.

It is not an unprimeable number, because it can be changed into a prime (20121349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11009 + ... + 12705.

It is an arithmetic number, because the mean of its divisors is an integer number (2567376).

Almost surely, 2^20121329 is an apocalyptic number.

It is an amenable number.

20121329 is a deficient number, since it is larger than the sum of its proper divisors (417679).

20121329 is a wasteful number, since it uses less digits than its factorization.

20121329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1935.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 20121329 is about 4485.6804389078. The cubic root of 20121329 is about 271.9895513936.

The spelling of 20121329 in words is "twenty million, one hundred twenty-one thousand, three hundred twenty-nine".