20440431001 has 4 divisors (see below), whose sum is σ = 20544189732. Its totient is φ = 20336672272.

The previous prime is 20440430987. The next prime is 20440431041. The reversal of 20440431001 is 10013404402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10013404402 = 2 ⋅5006702201.

It can be written as a sum of positive squares in 2 ways, for example, as 17256763225 + 3183667776 = 131365^2 + 56424^2 .

It is a cyclic number.

It is not a de Polignac number, because 20440431001 - 2¹⁵ = 20440398233 is a prime.

It is a super-2 number, since 2×20440431001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20440431001.

It is not an unprimeable number, because it can be changed into a prime (20440431041) 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, 51879070 + ... + 51879463.

It is an arithmetic number, because the mean of its divisors is an integer number (5136047433).

Almost surely, 2^20440431001 is an apocalyptic number.

It is an amenable number.

20440431001 is a deficient number, since it is larger than the sum of its proper divisors (103758731).

20440431001 is a wasteful number, since it uses less digits than its factorization.

20440431001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103758730.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20440431001 its reverse (10013404402), we get a palindrome (30453835403).

The spelling of 20440431001 in words is "twenty billion, four hundred forty million, four hundred thirty-one thousand, one".