20021271405 has 8 divisors (see below), whose sum is σ = 32034034272. Its totient is φ = 10678011408.

The previous prime is 20021271377. The next prime is 20021271419. The reversal of 20021271405 is 50417212002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20021271405 - 2⁵ = 20021271373 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 667375699 + ... + 667375728.

It is an arithmetic number, because the mean of its divisors is an integer number (4004254284).

Almost surely, 2^20021271405 is an apocalyptic number.

It is an amenable number.

20021271405 is a deficient number, since it is larger than the sum of its proper divisors (12012762867).

20021271405 is a wasteful number, since it uses less digits than its factorization.

20021271405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334751435.

The product of its (nonzero) digits is 1120, while the sum is 24.

Adding to 20021271405 its reverse (50417212002), we get a palindrome (70438483407).

The spelling of 20021271405 in words is "twenty billion, twenty-one million, two hundred seventy-one thousand, four hundred five".