20507644343 has 8 divisors (see below), whose sum is σ = 20553944880. Its totient is φ = 20461397760.

The previous prime is 20507644273. The next prime is 20507644349. The reversal of 20507644343 is 34344670502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20507644343 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20507644297 and 20507644306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20507644349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 802148 + ... + 827318.

It is an arithmetic number, because the mean of its divisors is an integer number (2569243110).

Almost surely, 2^20507644343 is an apocalyptic number.

20507644343 is a deficient number, since it is larger than the sum of its proper divisors (46300537).

20507644343 is an equidigital number, since it uses as much as digits as its factorization.

20507644343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26977.

The product of its (nonzero) digits is 241920, while the sum is 38.

The spelling of 20507644343 in words is "twenty billion, five hundred seven million, six hundred forty-four thousand, three hundred forty-three".