20990846143 has 2 divisors, whose sum is σ = 20990846144. Its totient is φ = 20990846142.

The previous prime is 20990846117. The next prime is 20990846189. The reversal of 20990846143 is 34164809902.

It is an a-pointer prime, because the next prime (20990846189) can be obtained adding 20990846143 to its sum of digits (46).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20990846143 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20990846093 and 20990846102.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20990846843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10495423071 + 10495423072.

It is an arithmetic number, because the mean of its divisors is an integer number (10495423072).

Almost surely, 2^20990846143 is an apocalyptic number.

20990846143 is a deficient number, since it is larger than the sum of its proper divisors (1).

20990846143 is an equidigital number, since it uses as much as digits as its factorization.

20990846143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 46.

The spelling of 20990846143 in words is "twenty billion, nine hundred ninety million, eight hundred forty-six thousand, one hundred forty-three".