20955239077 has 2 divisors, whose sum is σ = 20955239078. Its totient is φ = 20955239076.

The previous prime is 20955238973. The next prime is 20955239083. The reversal of 20955239077 is 77093255902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20924779716 + 30459361 = 144654^2 + 5519^2 .

It is a cyclic number.

It is not a de Polignac number, because 20955239077 - 2¹⁹ = 20954714789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20955239077.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20955230077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10477619538 + 10477619539.

It is an arithmetic number, because the mean of its divisors is an integer number (10477619539).

Almost surely, 2^20955239077 is an apocalyptic number.

It is an amenable number.

20955239077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20955239077 is an equidigital number, since it uses as much as digits as its factorization.

20955239077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1190700, while the sum is 49.

The spelling of 20955239077 in words is "twenty billion, nine hundred fifty-five million, two hundred thirty-nine thousand, seventy-seven".