20645463213 has 12 divisors (see below), whose sum is σ = 31390763040. Its totient is φ = 13039239816.

The previous prime is 20645463199. The next prime is 20645463247. The reversal of 20645463213 is 31236454602.

20645463213 is a `hidden beast` number, since 2 + 0 + 6 + 4 + 5 + 4 + 632 + 13 = 666.

It is not a de Polignac number, because 20645463213 - 2⁴ = 20645463197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645465213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60366681 + ... + 60367022.

It is an arithmetic number, because the mean of its divisors is an integer number (2615896920).

Almost surely, 2^20645463213 is an apocalyptic number.

It is an amenable number.

20645463213 is a deficient number, since it is larger than the sum of its proper divisors (10745299827).

20645463213 is a wasteful number, since it uses less digits than its factorization.

20645463213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120733728 (or 120733725 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The spelling of 20645463213 in words is "twenty billion, six hundred forty-five million, four hundred sixty-three thousand, two hundred thirteen".