20345129786 has 4 divisors (see below), whose sum is σ = 30517694682. Its totient is φ = 10172564892.

The previous prime is 20345129731. The next prime is 20345129813. The reversal of 20345129786 is 68792154302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20340179161 + 4950625 = 142619^2 + 2225^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20345129786.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5086282445 + ... + 5086282448.

It is a 1-persistent number, because it is pandigital, but 2⋅20345129786 = 40690259572 is not.

Almost surely, 2^20345129786 is an apocalyptic number.

20345129786 is a deficient number, since it is larger than the sum of its proper divisors (10172564896).

20345129786 is a wasteful number, since it uses less digits than its factorization.

20345129786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10172564895.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 20345129786 in words is "twenty billion, three hundred forty-five million, one hundred twenty-nine thousand, seven hundred eighty-six".