20308128703 has 4 divisors (see below), whose sum is σ = 20309504488. Its totient is φ = 20306752920.

The previous prime is 20308128683. The next prime is 20308128713. The reversal of 20308128703 is 30782180302.

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

It is a cyclic number.

It is not a de Polignac number, because 20308128703 - 2¹⁷ = 20307997631 is a prime.

It is a super-2 number, since 2×20308128703² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20308128713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 665508 + ... + 695353.

It is an arithmetic number, because the mean of its divisors is an integer number (5077376122).

Almost surely, 2^20308128703 is an apocalyptic number.

20308128703 is a deficient number, since it is larger than the sum of its proper divisors (1375785).

20308128703 is a wasteful number, since it uses less digits than its factorization.

20308128703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375784.

The product of its (nonzero) digits is 16128, while the sum is 34.

The spelling of 20308128703 in words is "twenty billion, three hundred eight million, one hundred twenty-eight thousand, seven hundred three".