20991407326 has 8 divisors (see below), whose sum is σ = 31866474024. Its totient is φ = 10369249320.

The previous prime is 20991407323. The next prime is 20991407377. The reversal of 20991407326 is 62370419902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20991407323) 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, 63226965 + ... + 63227296.

It is an arithmetic number, because the mean of its divisors is an integer number (3983309253).

Almost surely, 2^20991407326 is an apocalyptic number.

20991407326 is a deficient number, since it is larger than the sum of its proper divisors (10875066698).

20991407326 is a wasteful number, since it uses less digits than its factorization.

20991407326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126454346.

The product of its (nonzero) digits is 163296, while the sum is 43.

The spelling of 20991407326 in words is "twenty billion, nine hundred ninety-one million, four hundred seven thousand, three hundred twenty-six".