20879955049 has 2 divisors, whose sum is σ = 20879955050. Its totient is φ = 20879955048.

The previous prime is 20879955011. The next prime is 20879955071. The reversal of 20879955049 is 94055997802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18289857600 + 2590097449 = 135240^2 + 50893^2 .

It is a cyclic number.

It is not a de Polignac number, because 20879955049 - 2¹⁷ = 20879823977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20879954984 and 20879955002.

It is not a weakly prime, because it can be changed into another prime (20879955149) 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, 10439977524 + 10439977525.

It is an arithmetic number, because the mean of its divisors is an integer number (10439977525).

Almost surely, 2^20879955049 is an apocalyptic number.

It is an amenable number.

20879955049 is a deficient number, since it is larger than the sum of its proper divisors (1).

20879955049 is an equidigital number, since it uses as much as digits as its factorization.

20879955049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8164800, while the sum is 58.

The spelling of 20879955049 in words is "twenty billion, eight hundred seventy-nine million, nine hundred fifty-five thousand, forty-nine".