20430343765 has 8 divisors (see below), whose sum is σ = 26402290488.
Its totient is φ = 15087023040.
The previous prime is 20430343733. The next prime is 20430343771. The reversal of 20430343765 is 56734303402.
It can be written as a sum of positive squares in 4 ways, for example, as 17363889 + 20412979876 = 4167^2 + 142874^2
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 20430343765 - 25 = 20430343733 is a prime.
It is a Duffinian number.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157156426 + ... + 157156555.
It is an arithmetic number, because the mean of its divisors is an integer number (3300286311).
Almost surely, 220430343765 is an apocalyptic number.
It is an amenable number.
20430343765 is a deficient number, since it is larger than the sum of its proper divisors (5971946723).
20430343765 is a wasteful number, since it uses less digits than its factorization.
20430343765 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 314312999.
The product of its (nonzero) digits is 181440, while the sum is 37.
The spelling of 20430343765 in words is "twenty billion, four hundred thirty million, three hundred forty-three thousand, seven hundred sixty-five".