20253440001 has 4 divisors (see below), whose sum is σ = 27004586672. Its totient is φ = 13502293332.

The previous prime is 20253439961. The next prime is 20253440003. The reversal of 20253440001 is 10004435202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20253440001 - 2⁷ = 20253439873 is a prime.

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 20253440001.

It is not an unprimeable number, because it can be changed into a prime (20253440003) 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, 3375573331 + ... + 3375573336.

It is an arithmetic number, because the mean of its divisors is an integer number (6751146668).

Almost surely, 2^20253440001 is an apocalyptic number.

It is an amenable number.

20253440001 is a deficient number, since it is larger than the sum of its proper divisors (6751146671).

20253440001 is an equidigital number, since it uses as much as digits as its factorization.

20253440001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6751146670.

The product of its (nonzero) digits is 960, while the sum is 21.

Adding to 20253440001 its reverse (10004435202), we get a palindrome (30257875203).

The spelling of 20253440001 in words is "twenty billion, two hundred fifty-three million, four hundred forty thousand, one".