20145213 has 16 divisors (see below), whose sum is σ = 32558400. Its totient is φ = 12209040.

The previous prime is 20145193. The next prime is 20145233. The reversal of 20145213 is 31254102.

20145213 is a `hidden beast` number, since 201 + 452 + 13 = 666.

It is an interprime number because it is at equal distance from previous prime (20145193) and next prime (20145233).

It is not a de Polignac number, because 20145213 - 2¹⁶ = 20079677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20145233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33618 + ... + 34211.

It is an arithmetic number, because the mean of its divisors is an integer number (2034900).

Almost surely, 2^20145213 is an apocalyptic number.

It is an amenable number.

20145213 is a deficient number, since it is larger than the sum of its proper divisors (12413187).

20145213 is a wasteful number, since it uses less digits than its factorization.

20145213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67849 (or 67843 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20145213 is about 4488.3418987417. The cubic root of 20145213 is about 272.0971259614.

Adding to 20145213 its reverse (31254102), we get a palindrome (51399315).

Subtracting 20145213 from its reverse (31254102), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 2014 and 5213, that added together give a palindrome (7227).

The spelling of 20145213 in words is "twenty million, one hundred forty-five thousand, two hundred thirteen".