20323144002 has 64 divisors (see below), whose sum is σ = 49108101120. Its totient is φ = 5477341824.

The previous prime is 20323143979. The next prime is 20323144013. The reversal of 20323144002 is 20044132302.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 20323144002.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131283 + ... + 240585.

It is an arithmetic number, because the mean of its divisors is an integer number (767314080).

Almost surely, 2^20323144002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20323144002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24554050560).

20323144002 is an abundant number, since it is smaller than the sum of its proper divisors (28784957118).

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

20323144002 is a wasteful number, since it uses less digits than its factorization.

20323144002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109567.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 20323144002 its reverse (20044132302), we get a palindrome (40367276304).

The spelling of 20323144002 in words is "twenty billion, three hundred twenty-three million, one hundred forty-four thousand, two".