20802875620949 has 2 divisors, whose sum is σ = 20802875620950. Its totient is φ = 20802875620948.

The previous prime is 20802875620847. The next prime is 20802875620951. The reversal of 20802875620949 is 94902657820802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20636804700625 + 166070920324 = 4542775^2 + 407518^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20802875620949 is a prime.

Together with 20802875620951, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20802875620891 and 20802875620900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20802875620049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10401437810474 + 10401437810475.

It is an arithmetic number, because the mean of its divisors is an integer number (10401437810475).

Almost surely, 2^{20802875620949} is an apocalyptic number.

It is an amenable number.

20802875620949 is a deficient number, since it is larger than the sum of its proper divisors (1).

20802875620949 is an equidigital number, since it uses as much as digits as its factorization.

20802875620949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34836480, while the sum is 62.

The spelling of 20802875620949 in words is "twenty trillion, eight hundred two billion, eight hundred seventy-five million, six hundred twenty thousand, nine hundred forty-nine".