20665224013 has 4 divisors (see below), whose sum is σ = 23617398880. Its totient is φ = 17713049148.

The previous prime is 20665224001. The next prime is 20665224043. The reversal of 20665224013 is 31042256602.

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 20665224013 - 2⁵ = 20665223981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20665224043) 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, 1476087423 + ... + 1476087436.

It is an arithmetic number, because the mean of its divisors is an integer number (5904349720).

Almost surely, 2^20665224013 is an apocalyptic number.

It is an amenable number.

20665224013 is a deficient number, since it is larger than the sum of its proper divisors (2952174867).

20665224013 is an equidigital number, since it uses as much as digits as its factorization.

20665224013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2952174866.

The product of its (nonzero) digits is 17280, while the sum is 31.

The spelling of 20665224013 in words is "twenty billion, six hundred sixty-five million, two hundred twenty-four thousand, thirteen".