20321312202 has 96 divisors (see below), whose sum is σ = 47120486400. Its totient is φ = 6307144704.

The previous prime is 20321312191. The next prime is 20321312203. The reversal of 20321312202 is 20221312302.

It is a super-2 number, since 2×20321312202² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20321312203) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15887799 + ... + 15889077.

It is an arithmetic number, because the mean of its divisors is an integer number (490838400).

Almost surely, 2^20321312202 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20321312202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23560243200).

20321312202 is an abundant number, since it is smaller than the sum of its proper divisors (26799174198).

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

20321312202 is a wasteful number, since it uses less digits than its factorization.

20321312202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820 (or 1817 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20321312202 its reverse (20221312302), we get a palindrome (40542624504).

The spelling of 20321312202 in words is "twenty billion, three hundred twenty-one million, three hundred twelve thousand, two hundred two".