20005423105 has 8 divisors (see below), whose sum is σ = 24109541352. Its totient is φ = 15935649408.

The previous prime is 20005423093. The next prime is 20005423117. The reversal of 20005423105 is 50132450002.

It is an interprime number because it is at equal distance from previous prime (20005423093) and next prime (20005423117).

It can be written as a sum of positive squares in 4 ways, for example, as 286523329 + 19718899776 = 16927^2 + 140424^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20005423105 - 2¹⁵ = 20005390337 is a prime.

It is a super-2 number, since 2×20005423105² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8584854 + ... + 8587183.

It is an arithmetic number, because the mean of its divisors is an integer number (3013692669).

Almost surely, 2^20005423105 is an apocalyptic number.

It is an amenable number.

20005423105 is a deficient number, since it is larger than the sum of its proper divisors (4104118247).

20005423105 is a wasteful number, since it uses less digits than its factorization.

20005423105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17172275.

The product of its (nonzero) digits is 1200, while the sum is 22.

Adding to 20005423105 its reverse (50132450002), we get a palindrome (70137873107).

The spelling of 20005423105 in words is "twenty billion, five million, four hundred twenty-three thousand, one hundred five".