20031121 has 8 divisors (see below), whose sum is σ = 21887424. Its totient is φ = 18180720.

The previous prime is 20031103. The next prime is 20031139. The reversal of 20031121 is 12113002.

It is an interprime number because it is at equal distance from previous prime (20031103) and next prime (20031139).

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 20031121 - 2¹¹ = 20029073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20031098 and 20031107.

It is not an unprimeable number, because it can be changed into a prime (20031101) 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, 8731 + ... + 10783.

It is an arithmetic number, because the mean of its divisors is an integer number (2735928).

Almost surely, 2^20031121 is an apocalyptic number.

It is an amenable number.

20031121 is a deficient number, since it is larger than the sum of its proper divisors (1856303).

20031121 is a wasteful number, since it uses less digits than its factorization.

20031121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2951.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 20031121 is about 4475.6140360849. The cubic root of 20031121 is about 271.5824810137.

Adding to 20031121 its reverse (12113002), we get a palindrome (32144123).

The spelling of 20031121 in words is "twenty million, thirty-one thousand, one hundred twenty-one".