20609769413 has 4 divisors (see below), whose sum is σ = 21505846368. Its totient is φ = 19713692460.

The previous prime is 20609769407. The next prime is 20609769419. The reversal of 20609769413 is 31496790602.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31496790602 = 2 ⋅15748395301.

It is an interprime number because it is at equal distance from previous prime (20609769407) and next prime (20609769419).

It is a cyclic number.

It is not a de Polignac number, because 20609769413 - 2²⁰ = 20608720837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20609769419) 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, 448038443 + ... + 448038488.

It is an arithmetic number, because the mean of its divisors is an integer number (5376461592).

Almost surely, 2^20609769413 is an apocalyptic number.

20609769413 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20609769413 is a deficient number, since it is larger than the sum of its proper divisors (896076955).

20609769413 is an equidigital number, since it uses as much as digits as its factorization.

20609769413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896076954.

The product of its (nonzero) digits is 489888, while the sum is 47.

The spelling of 20609769413 in words is "twenty billion, six hundred nine million, seven hundred sixty-nine thousand, four hundred thirteen".