20001131422440 has 96 divisors (see below), whose sum is σ = 69799866821280. Its totient is φ = 4571687180928.

The previous prime is 20001131422429. The next prime is 20001131422457. The reversal of 20001131422440 is 4422413110002.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20001131422440.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1700770602 + ... + 1700782361.

It is an arithmetic number, because the mean of its divisors is an integer number (727081946055).

Almost surely, 2^{20001131422440} is an apocalyptic number.

20001131422440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001131422440 is an abundant number, since it is smaller than the sum of its proper divisors (49798735398840).

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

20001131422440 is a wasteful number, since it uses less digits than its factorization.

20001131422440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3401552991 (or 3401552980 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 20001131422440 its reverse (4422413110002), we get a palindrome (24423544532442).

The spelling of 20001131422440 in words is "twenty trillion, one billion, one hundred thirty-one million, four hundred twenty-two thousand, four hundred forty".