20434403989 has 4 divisors (see below), whose sum is σ = 20441955424. Its totient is φ = 20426852556.

The previous prime is 20434403947. The next prime is 20434404017. The reversal of 20434403989 is 98930443402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20434403989 - 2¹⁷ = 20434272917 is a prime.

It is a super-2 number, since 2×20434403989² (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 (20434400989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3771657 + ... + 3777070.

It is an arithmetic number, because the mean of its divisors is an integer number (5110488856).

Almost surely, 2^20434403989 is an apocalyptic number.

It is an amenable number.

20434403989 is a deficient number, since it is larger than the sum of its proper divisors (7551435).

20434403989 is an equidigital number, since it uses as much as digits as its factorization.

20434403989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7551434.

The product of its (nonzero) digits is 746496, while the sum is 46.

The spelling of 20434403989 in words is "twenty billion, four hundred thirty-four million, four hundred three thousand, nine hundred eighty-nine".