20801235708447 has 16 divisors (see below), whose sum is σ = 27807360040320. Its totient is φ = 13831348020192.

The previous prime is 20801235708413. The next prime is 20801235708509. The reversal of 20801235708447 is 74480753210802.

It is a happy number.

It is not a de Polignac number, because 20801235708447 - 2¹⁵ = 20801235675679 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20801235708447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20801235700447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4119253 + ... + 7653150.

It is an arithmetic number, because the mean of its divisors is an integer number (1737960002520).

Almost surely, 2^{20801235708447} is an apocalyptic number.

20801235708447 is a deficient number, since it is larger than the sum of its proper divisors (7006124331873).

20801235708447 is a wasteful number, since it uses less digits than its factorization.

20801235708447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11773942.

The product of its (nonzero) digits is 3010560, while the sum is 51.

The spelling of 20801235708447 in words is "twenty trillion, eight hundred one billion, two hundred thirty-five million, seven hundred eight thousand, four hundred forty-seven".