20591380369 has 4 divisors (see below), whose sum is σ = 23533006144. Its totient is φ = 17649754596.

The previous prime is 20591380343. The next prime is 20591380421. The reversal of 20591380369 is 96308319502.

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: 96308319502 = 2 ⋅48154159751.

It is a cyclic number.

It is not a de Polignac number, because 20591380369 - 2¹¹ = 20591378321 is a prime.

It is a super-3 number, since 3×20591380369³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20591380309) 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, 1470812877 + ... + 1470812890.

It is an arithmetic number, because the mean of its divisors is an integer number (5883251536).

Almost surely, 2^20591380369 is an apocalyptic number.

It is an amenable number.

20591380369 is a deficient number, since it is larger than the sum of its proper divisors (2941625775).

20591380369 is an equidigital number, since it uses as much as digits as its factorization.

20591380369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2941625774.

The product of its (nonzero) digits is 349920, while the sum is 46.

It can be divided in two parts, 20591 and 380369, that added together give a triangular number (400960 = T₈₉₅).

The spelling of 20591380369 in words is "twenty billion, five hundred ninety-one million, three hundred eighty thousand, three hundred sixty-nine".