20434403993 has 16 divisors (see below), whose sum is σ = 22120560000. Its totient is φ = 18810703872.

The previous prime is 20434403947. The next prime is 20434404017. The reversal of 20434403993 is 39930443402.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20434403993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20434403993.

It is not an unprimeable number, because it can be changed into a prime (20434403933) 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, 521708 + ... + 559506.

It is an arithmetic number, because the mean of its divisors is an integer number (1382535000).

Almost surely, 2^20434403993 is an apocalyptic number.

It is an amenable number.

20434403993 is a deficient number, since it is larger than the sum of its proper divisors (1686156007).

20434403993 is a wasteful number, since it uses less digits than its factorization.

20434403993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38624.

The product of its (nonzero) digits is 279936, while the sum is 41.

The spelling of 20434403993 in words is "twenty billion, four hundred thirty-four million, four hundred three thousand, nine hundred ninety-three".