20685448043 has 16 divisors (see below), whose sum is σ = 22832011776. Its totient is φ = 18618716160.

The previous prime is 20685448039. The next prime is 20685448057. The reversal of 20685448043 is 34084458602.

It is a cyclic number.

It is not a de Polignac number, because 20685448043 - 2² = 20685448039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20685447985 and 20685448003.

It is not an unprimeable number, because it can be changed into a prime (20685448073) 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 15 ways as a sum of consecutive naturals, for example, 1117046 + ... + 1135412.

It is an arithmetic number, because the mean of its divisors is an integer number (1427000736).

Almost surely, 2^20685448043 is an apocalyptic number.

20685448043 is a deficient number, since it is larger than the sum of its proper divisors (2146563733).

20685448043 is a wasteful number, since it uses less digits than its factorization.

20685448043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20534.

The product of its (nonzero) digits is 737280, while the sum is 44.

The spelling of 20685448043 in words is "twenty billion, six hundred eighty-five million, four hundred forty-eight thousand, forty-three".