20823644415 has 192 divisors, whose sum is σ = 42613309440. Its totient is φ = 8624206080.

The previous prime is 20823644399. The next prime is 20823644417. The reversal of 20823644415 is 51444632802.

It is a Cunningham number, because it is equal to 144304²-1.

It is not a de Polignac number, because 20823644415 - 2⁴ = 20823644399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20823644417) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 44590012 + ... + 44590478.

It is an arithmetic number, because the mean of its divisors is an integer number (221944320).

Almost surely, 2^20823644415 is an apocalyptic number.

20823644415 is an abundant number, since it is smaller than the sum of its proper divisors (21789665025).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20823644415 is a wasteful number, since it uses less digits than its factorization.

20823644415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642 (or 635 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 39.

The spelling of 20823644415 in words is "twenty billion, eight hundred twenty-three million, six hundred forty-four thousand, four hundred fifteen".