20445253213 has 16 divisors (see below), whose sum is σ = 25580284416. Its totient is φ = 15875054640.

The previous prime is 20445253193. The next prime is 20445253217. The reversal of 20445253213 is 31235254402.

It is a cyclic number.

It is not a de Polignac number, because 20445253213 - 2⁵ = 20445253181 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 (20445253217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 447331 + ... + 490912.

It is an arithmetic number, because the mean of its divisors is an integer number (1598767776).

Almost surely, 2^20445253213 is an apocalyptic number.

It is an amenable number.

20445253213 is a deficient number, since it is larger than the sum of its proper divisors (5135031203).

20445253213 is a wasteful number, since it uses less digits than its factorization.

20445253213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938544.

The product of its (nonzero) digits is 28800, while the sum is 31.

The spelling of 20445253213 in words is "twenty billion, four hundred forty-five million, two hundred fifty-three thousand, two hundred thirteen".