20853670477 has 2 divisors, whose sum is σ = 20853670478. Its totient is φ = 20853670476.

The previous prime is 20853670441. The next prime is 20853670507. The reversal of 20853670477 is 77407635802.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18697554121 + 2156116356 = 136739^2 + 46434^2 .

It is a cyclic number.

It is not a de Polignac number, because 20853670477 - 2¹⁹ = 20853146189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20853670477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20853670777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10426835238 + 10426835239.

It is an arithmetic number, because the mean of its divisors is an integer number (10426835239).

Almost surely, 2^20853670477 is an apocalyptic number.

It is an amenable number.

20853670477 is a deficient number, since it is larger than the sum of its proper divisors (1).

20853670477 is an equidigital number, since it uses as much as digits as its factorization.

20853670477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1975680, while the sum is 49.

The spelling of 20853670477 in words is "twenty billion, eight hundred fifty-three million, six hundred seventy thousand, four hundred seventy-seven".