20708913393 has 12 divisors (see below), whose sum is σ = 34186142848. Its totient is φ = 11833664760.

The previous prime is 20708913367. The next prime is 20708913403. The reversal of 20708913393 is 39331980702.

It is not a de Polignac number, because 20708913393 - 2⁹ = 20708912881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20708913893) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 164356393 + ... + 164356518.

Almost surely, 2^20708913393 is an apocalyptic number.

It is an amenable number.

20708913393 is a deficient number, since it is larger than the sum of its proper divisors (13477229455).

20708913393 is a wasteful number, since it uses less digits than its factorization.

20708913393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328712924 (or 328712921 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The spelling of 20708913393 in words is "twenty billion, seven hundred eight million, nine hundred thirteen thousand, three hundred ninety-three".