20420140413 has 4 divisors (see below), whose sum is σ = 27226853888. Its totient is φ = 13613426940.

The previous prime is 20420140409. The next prime is 20420140421. The reversal of 20420140413 is 31404102402.

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 20420140413 - 2² = 20420140409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20420140413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420140513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3403356733 + ... + 3403356738.

It is an arithmetic number, because the mean of its divisors is an integer number (6806713472).

Almost surely, 2^20420140413 is an apocalyptic number.

It is an amenable number.

20420140413 is a deficient number, since it is larger than the sum of its proper divisors (6806713475).

20420140413 is an equidigital number, since it uses as much as digits as its factorization.

20420140413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6806713474.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 20420140413 its reverse (31404102402), we get a palindrome (51824242815).

The spelling of 20420140413 in words is "twenty billion, four hundred twenty million, one hundred forty thousand, four hundred thirteen".