20979163741 has 2 divisors, whose sum is σ = 20979163742. Its totient is φ = 20979163740.

The previous prime is 20979163729. The next prime is 20979163763. The reversal of 20979163741 is 14736197902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15377240025 + 5601923716 = 124005^2 + 74846^2 .

It is a cyclic number.

It is not a de Polignac number, because 20979163741 - 2¹⁵ = 20979130973 is a prime.

It is a super-2 number, since 2×20979163741² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20979163721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10489581870 + 10489581871.

It is an arithmetic number, because the mean of its divisors is an integer number (10489581871).

Almost surely, 2^20979163741 is an apocalyptic number.

It is an amenable number.

20979163741 is a deficient number, since it is larger than the sum of its proper divisors (1).

20979163741 is an equidigital number, since it uses as much as digits as its factorization.

20979163741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 571536, while the sum is 49.

The spelling of 20979163741 in words is "twenty billion, nine hundred seventy-nine million, one hundred sixty-three thousand, seven hundred forty-one".