20669520043 has 4 divisors (see below), whose sum is σ = 20670305728. Its totient is φ = 20668734360.

The previous prime is 20669520031. The next prime is 20669520083. The reversal of 20669520043 is 34002596602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20669520043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20669519984 and 20669520011.

It is not an unprimeable number, because it can be changed into a prime (20669520083) 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, 351963 + ... + 406468.

It is an arithmetic number, because the mean of its divisors is an integer number (5167576432).

Almost surely, 2^20669520043 is an apocalyptic number.

20669520043 is a deficient number, since it is larger than the sum of its proper divisors (785685).

20669520043 is an equidigital number, since it uses as much as digits as its factorization.

20669520043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785684.

The product of its (nonzero) digits is 77760, while the sum is 37.

The spelling of 20669520043 in words is "twenty billion, six hundred sixty-nine million, five hundred twenty thousand, forty-three".