20440523143404 has 288 divisors, whose sum is σ = 65835480023040. Its totient is φ = 5203927378944.

The previous prime is 20440523143379. The next prime is 20440523143429. The reversal of 20440523143404 is 40434132504402.

20440523143404 is a `hidden beast` number, since 20 + 4 + 40 + 52 + 3 + 143 + 404 = 666.

It is an interprime number because it is at equal distance from previous prime (20440523143379) and next prime (20440523143429).

It is a super-2 number, since 2×20440523143404² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10330677 + ... + 12149235.

Almost surely, 2^{20440523143404} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20440523143404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32917740011520).

20440523143404 is an abundant number, since it is smaller than the sum of its proper divisors (45394956879636).

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

20440523143404 is a wasteful number, since it uses less digits than its factorization.

20440523143404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818709 (or 1818704 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 36.

Adding to 20440523143404 its reverse (40434132504402), we get a palindrome (60874655647806).

The spelling of 20440523143404 in words is "twenty trillion, four hundred forty billion, five hundred twenty-three million, one hundred forty-three thousand, four hundred four".