20440621371 has 4 divisors (see below), whose sum is σ = 27254161832. Its totient is φ = 13627080912.

The previous prime is 20440621351. The next prime is 20440621393. The reversal of 20440621371 is 17312604402.

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

It is not a de Polignac number, because 20440621371 - 2⁶ = 20440621307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20440621321) 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, 3406770226 + ... + 3406770231.

It is an arithmetic number, because the mean of its divisors is an integer number (6813540458).

Almost surely, 2^20440621371 is an apocalyptic number.

20440621371 is a deficient number, since it is larger than the sum of its proper divisors (6813540461).

20440621371 is an equidigital number, since it uses as much as digits as its factorization.

20440621371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6813540460.

The product of its (nonzero) digits is 8064, while the sum is 30.

The spelling of 20440621371 in words is "twenty billion, four hundred forty million, six hundred twenty-one thousand, three hundred seventy-one".