20445438213 has 12 divisors (see below), whose sum is σ = 29536517920. Its totient is φ = 13628345256.

The previous prime is 20445438199. The next prime is 20445438227. The reversal of 20445438213 is 31283454402.

20445438213 is a `hidden beast` number, since 2 + 0 + 4 + 4 + 5 + 438 + 213 = 666.

It is an interprime number because it is at equal distance from previous prime (20445438199) and next prime (20445438227).

It is not a de Polignac number, because 20445438213 - 2⁶ = 20445438149 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 (20445438253) 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, 94231 + ... + 223092.

Almost surely, 2^20445438213 is an apocalyptic number.

It is an amenable number.

20445438213 is a deficient number, since it is larger than the sum of its proper divisors (9091079707).

20445438213 is a wasteful number, since it uses less digits than its factorization.

20445438213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324488 (or 324485 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

The spelling of 20445438213 in words is "twenty billion, four hundred forty-five million, four hundred thirty-eight thousand, two hundred thirteen".