20944728061 has 2 divisors, whose sum is σ = 20944728062. Its totient is φ = 20944728060.

The previous prime is 20944728053. The next prime is 20944728089. The reversal of 20944728061 is 16082744902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17690596036 + 3254132025 = 133006^2 + 57045^2 .

It is a cyclic number.

It is not a de Polignac number, because 20944728061 - 2³ = 20944728053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20944727999 and 20944728017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20944728001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10472364030 + 10472364031.

It is an arithmetic number, because the mean of its divisors is an integer number (10472364031).

Almost surely, 2^20944728061 is an apocalyptic number.

It is an amenable number.

20944728061 is a deficient number, since it is larger than the sum of its proper divisors (1).

20944728061 is an equidigital number, since it uses as much as digits as its factorization.

20944728061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 20944728061 in words is "twenty billion, nine hundred forty-four million, seven hundred twenty-eight thousand, sixty-one".