20684796447 has 32 divisors (see below), whose sum is σ = 33272064000. Its totient is φ = 11412285024.

The previous prime is 20684796439. The next prime is 20684796523. The reversal of 20684796447 is 74469748602.

It is a happy number.

It is not a de Polignac number, because 20684796447 - 2³ = 20684796439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20684796347) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 316743 + ... + 376424.

It is an arithmetic number, because the mean of its divisors is an integer number (1039752000).

Almost surely, 2^20684796447 is an apocalyptic number.

20684796447 is a deficient number, since it is larger than the sum of its proper divisors (12587267553).

20684796447 is an equidigital number, since it uses as much as digits as its factorization.

20684796447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693220 (or 693206 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 57.

The spelling of 20684796447 in words is "twenty billion, six hundred eighty-four million, seven hundred ninety-six thousand, four hundred forty-seven".