20685574277803 has 2 divisors, whose sum is σ = 20685574277804. Its totient is φ = 20685574277802.

The previous prime is 20685574277791. The next prime is 20685574277813. The reversal of 20685574277803 is 30877247558602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20685574277803 is a prime.

It is not a weakly prime, because it can be changed into another prime (20685574277813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10342787138901 + 10342787138902.

It is an arithmetic number, because the mean of its divisors is an integer number (10342787138902).

Almost surely, 2^{20685574277803} is an apocalyptic number.

20685574277803 is a deficient number, since it is larger than the sum of its proper divisors (1).

20685574277803 is an equidigital number, since it uses as much as digits as its factorization.

20685574277803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 158054400, while the sum is 64.

The spelling of 20685574277803 in words is "twenty trillion, six hundred eighty-five billion, five hundred seventy-four million, two hundred seventy-seven thousand, eight hundred three".