20023031440 has 160 divisors (see below), whose sum is σ = 52332364800. Its totient is φ = 7089223680.

The previous prime is 20023031419. The next prime is 20023031447. The reversal of 20023031440 is 4413032002.

It is a super-5 number, since 5×20023031440⁵ (a number of 53 digits) contains 55555 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (20023031447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1359154 + ... + 1373806.

It is an arithmetic number, because the mean of its divisors is an integer number (327077280).

Almost surely, 2^20023031440 is an apocalyptic number.

20023031440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20023031440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26166182400).

20023031440 is an abundant number, since it is smaller than the sum of its proper divisors (32309333360).

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

20023031440 is a wasteful number, since it uses less digits than its factorization.

20023031440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14745 (or 14739 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 20023031440 its reverse (4413032002), we get a palindrome (24436063442).

The spelling of 20023031440 in words is "twenty billion, twenty-three million, thirty-one thousand, four hundred forty".