20321232013 has 16 divisors (see below), whose sum is σ = 23175789120. Its totient is φ = 17697851136.

The previous prime is 20321232007. The next prime is 20321232049. The reversal of 20321232013 is 31023212302.

It is a cyclic number.

It is not a de Polignac number, because 20321232013 - 2¹³ = 20321223821 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321232073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 717670 + ... + 745447.

It is an arithmetic number, because the mean of its divisors is an integer number (1448486820).

Almost surely, 2^20321232013 is an apocalyptic number.

It is an amenable number.

20321232013 is a deficient number, since it is larger than the sum of its proper divisors (2854557107).

20321232013 is a wasteful number, since it uses less digits than its factorization.

20321232013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463196.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 20321232013 its reverse (31023212302), we get a palindrome (51344444315).

It can be divided in two parts, 203212 and 32013, that added together give a square (235225 = 485²).

The spelling of 20321232013 in words is "twenty billion, three hundred twenty-one million, two hundred thirty-two thousand, thirteen".