20001250405 has 4 divisors (see below), whose sum is σ = 24001500492. Its totient is φ = 16001000320.

The previous prime is 20001250403. The next prime is 20001250427. The reversal of 20001250405 is 50405210002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3211828929 + 16789421476 = 56673^2 + 129574^2 .

It is not a de Polignac number, because 20001250405 - 2¹ = 20001250403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001250403) 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, 2000125036 + ... + 2000125045.

It is an arithmetic number, because the mean of its divisors is an integer number (6000375123).

Almost surely, 2^20001250405 is an apocalyptic number.

It is an amenable number.

20001250405 is a deficient number, since it is larger than the sum of its proper divisors (4000250087).

20001250405 is an equidigital number, since it uses as much as digits as its factorization.

20001250405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4000250086.

The product of its (nonzero) digits is 400, while the sum is 19.

Adding to 20001250405 its reverse (50405210002), we get a palindrome (70406460407).

The spelling of 20001250405 in words is "twenty billion, one million, two hundred fifty thousand, four hundred five".