20803843655 has 16 divisors (see below), whose sum is σ = 28825124160. Its totient is φ = 14118423552.

The previous prime is 20803843561. The next prime is 20803843657. The reversal of 20803843655 is 55634830802.

It is a cyclic number.

It is not a de Polignac number, because 20803843655 - 2¹⁴ = 20803827271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20803843657) 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, 3060500 + ... + 3067289.

It is an arithmetic number, because the mean of its divisors is an integer number (1801570260).

Almost surely, 2^20803843655 is an apocalyptic number.

20803843655 is a deficient number, since it is larger than the sum of its proper divisors (8021280505).

20803843655 is an equidigital number, since it uses as much as digits as its factorization.

20803843655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6127898.

The product of its (nonzero) digits is 691200, while the sum is 44.

The spelling of 20803843655 in words is "twenty billion, eight hundred three million, eight hundred forty-three thousand, six hundred fifty-five".