20330031144 has 16 divisors (see below), whose sum is σ = 50825077920. Its totient is φ = 6776677040.

The previous prime is 20330031143. The next prime is 20330031173. The reversal of 20330031144 is 44113003302.

It is a self number, because there is not a number n which added to its sum of digits gives 20330031144.

It is not an unprimeable number, because it can be changed into a prime (20330031143) 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, 423542292 + ... + 423542339.

It is an arithmetic number, because the mean of its divisors is an integer number (3176567370).

Almost surely, 2^20330031144 is an apocalyptic number.

20330031144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20330031144 is an abundant number, since it is smaller than the sum of its proper divisors (30495046776).

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

20330031144 is a wasteful number, since it uses less digits than its factorization.

20330031144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847084640 (or 847084636 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 20330031144 its reverse (44113003302), we get a palindrome (64443034446).

The spelling of 20330031144 in words is "twenty billion, three hundred thirty million, thirty-one thousand, one hundred forty-four".