20340430993 has 16 divisors (see below), whose sum is σ = 21158020800. Its totient is φ = 19539083520.

The previous prime is 20340430961. The next prime is 20340431003. The reversal of 20340430993 is 39903404302.

It is a cyclic number.

It is not a de Polignac number, because 20340430993 - 2⁵ = 20340430961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20340430393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1847178 + ... + 1858156.

It is an arithmetic number, because the mean of its divisors is an integer number (1322376300).

Almost surely, 2^20340430993 is an apocalyptic number.

It is an amenable number.

20340430993 is a deficient number, since it is larger than the sum of its proper divisors (817589807).

20340430993 is a wasteful number, since it uses less digits than its factorization.

20340430993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11712.

The product of its (nonzero) digits is 69984, while the sum is 37.

The spelling of 20340430993 in words is "twenty billion, three hundred forty million, four hundred thirty thousand, nine hundred ninety-three".