20969847349 has 4 divisors (see below), whose sum is σ = 22876197120. Its totient is φ = 19063497580.

The previous prime is 20969847299. The next prime is 20969847383. The reversal of 20969847349 is 94374896902.

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 a cyclic number.

It is not a de Polignac number, because 20969847349 - 2⁹ = 20969846837 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 (20969847749) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 953174869 + ... + 953174890.

It is an arithmetic number, because the mean of its divisors is an integer number (5719049280).

Almost surely, 2^20969847349 is an apocalyptic number.

It is an amenable number.

20969847349 is a deficient number, since it is larger than the sum of its proper divisors (1906349771).

20969847349 is a wasteful number, since it uses less digits than its factorization.

20969847349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1906349770.

The product of its (nonzero) digits is 23514624, while the sum is 61.

The spelling of 20969847349 in words is "twenty billion, nine hundred sixty-nine million, eight hundred forty-seven thousand, three hundred forty-nine".