20013321 has 8 divisors (see below), whose sum is σ = 27545344. Its totient is φ = 12911760.

The previous prime is 20013319. The next prime is 20013347. The reversal of 20013321 is 12331002.

It is a happy number.

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

It is not a de Polignac number, because 20013321 - 2¹ = 20013319 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20013297 and 20013306.

It is not an unprimeable number, because it can be changed into a prime (20013311) 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, 107506 + ... + 107691.

It is an arithmetic number, because the mean of its divisors is an integer number (3443168).

Almost surely, 2^20013321 is an apocalyptic number.

It is an amenable number.

20013321 is a deficient number, since it is larger than the sum of its proper divisors (7532023).

20013321 is a wasteful number, since it uses less digits than its factorization.

20013321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215231.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 20013321 is about 4473.6250401660. The cubic root of 20013321 is about 271.5020128798.

Adding to 20013321 its reverse (12331002), we get a palindrome (32344323).

The spelling of 20013321 in words is "twenty million, thirteen thousand, three hundred twenty-one".