20405685103 has 2 divisors, whose sum is σ = 20405685104. Its totient is φ = 20405685102.

The previous prime is 20405684983. The next prime is 20405685107. The reversal of 20405685103 is 30158650402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20405685103 - 2¹⁷ = 20405554031 is a prime.

It is a super-2 number, since 2×20405685103² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20405685107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202842551 + 10202842552.

It is an arithmetic number, because the mean of its divisors is an integer number (10202842552).

Almost surely, 2^20405685103 is an apocalyptic number.

20405685103 is a deficient number, since it is larger than the sum of its proper divisors (1).

20405685103 is an equidigital number, since it uses as much as digits as its factorization.

20405685103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 34.

The spelling of 20405685103 in words is "twenty billion, four hundred five million, six hundred eighty-five thousand, one hundred three".