20402243413 has 4 divisors (see below), whose sum is σ = 20899859148. Its totient is φ = 19904627680.

The previous prime is 20402243353. The next prime is 20402243419. The reversal of 20402243413 is 31434220402.

It is a happy number.

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 10849722244 + 9552521169 = 104162^2 + 97737^2 .

It is a cyclic number.

It is not a de Polignac number, because 20402243413 - 2⁹ = 20402242901 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 (20402243419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248807806 + ... + 248807887.

It is an arithmetic number, because the mean of its divisors is an integer number (5224964787).

Almost surely, 2^20402243413 is an apocalyptic number.

It is an amenable number.

20402243413 is a deficient number, since it is larger than the sum of its proper divisors (497615735).

20402243413 is an equidigital number, since it uses as much as digits as its factorization.

20402243413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497615734.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 20402243413 its reverse (31434220402), we get a palindrome (51836463815).

The spelling of 20402243413 in words is "twenty billion, four hundred two million, two hundred forty-three thousand, four hundred thirteen".