20354321 has 16 divisors (see below), whose sum is σ = 23966208. Its totient is φ = 17107200.

The previous prime is 20354311. The next prime is 20354357. The reversal of 20354321 is 12345302.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20354321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20354293 and 20354302.

It is not an unprimeable number, because it can be changed into a prime (20354311) 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 15 ways as a sum of consecutive naturals, for example, 5366 + ... + 8336.

It is an arithmetic number, because the mean of its divisors is an integer number (1497888).

Almost surely, 2^20354321 is an apocalyptic number.

It is an amenable number.

20354321 is a deficient number, since it is larger than the sum of its proper divisors (3611887).

20354321 is a wasteful number, since it uses less digits than its factorization.

20354321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3032.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20354321 is about 4511.5763320596. The cubic root of 20354321 is about 273.0353463159.

Adding to 20354321 its reverse (12345302), we get a palindrome (32699623).

The spelling of 20354321 in words is "twenty million, three hundred fifty-four thousand, three hundred twenty-one".