20321310436 has 12 divisors (see below), whose sum is σ = 40642620928. Its totient is φ = 8709133032.

The previous prime is 20321310419. The next prime is 20321310437. The reversal of 20321310436 is 63401312302.

20321310436 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 20321310436.

It is not an unprimeable number, because it can be changed into a prime (20321310437) 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, 362880516 + ... + 362880571.

Almost surely, 2^20321310436 is an apocalyptic number.

It is an amenable number.

20321310436 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20321310436 is a wasteful number, since it uses less digits than its factorization.

20321310436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725761098 (or 725761096 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 20321310436 its reverse (63401312302), we get a palindrome (83722622738).

The spelling of 20321310436 in words is "twenty billion, three hundred twenty-one million, three hundred ten thousand, four hundred thirty-six".