20354578813 has 2 divisors, whose sum is σ = 20354578814. Its totient is φ = 20354578812.

The previous prime is 20354578807. The next prime is 20354578819. The reversal of 20354578813 is 31887545302.

It is a balanced prime because it is at equal distance from previous prime (20354578807) and next prime (20354578819).

It can be written as a sum of positive squares in only one way, i.e., 16780093444 + 3574485369 = 129538^2 + 59787^2 .

It is a cyclic number.

It is not a de Polignac number, because 20354578813 - 2¹⁷ = 20354447741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20354578819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10177289406 + 10177289407.

It is an arithmetic number, because the mean of its divisors is an integer number (10177289407).

Almost surely, 2^20354578813 is an apocalyptic number.

It is an amenable number.

20354578813 is a deficient number, since it is larger than the sum of its proper divisors (1).

20354578813 is an equidigital number, since it uses as much as digits as its factorization.

20354578813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 806400, while the sum is 46.

The spelling of 20354578813 in words is "twenty billion, three hundred fifty-four million, five hundred seventy-eight thousand, eight hundred thirteen".