20343121 has 4 divisors (see below), whose sum is σ = 20498544. Its totient is φ = 20187700.

The previous prime is 20343097. The next prime is 20343137. The reversal of 20343121 is 12134302.

It is a happy number.

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 20343121 - 2¹¹ = 20341073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20343095 and 20343104.

It is not an unprimeable number, because it can be changed into a prime (20346121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77515 + ... + 77776.

It is an arithmetic number, because the mean of its divisors is an integer number (5124636).

Almost surely, 2^20343121 is an apocalyptic number.

It is an amenable number.

20343121 is a deficient number, since it is larger than the sum of its proper divisors (155423).

20343121 is a wasteful number, since it uses less digits than its factorization.

20343121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155422.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20343121 is about 4510.3349099596. The cubic root of 20343121 is about 272.9852577386.

Adding to 20343121 its reverse (12134302), we get a palindrome (32477423).

The spelling of 20343121 in words is "twenty million, three hundred forty-three thousand, one hundred twenty-one".