20701213 has 4 divisors (see below), whose sum is σ = 22293628. Its totient is φ = 19108800.

The previous prime is 20701207. The next prime is 20701229. The reversal of 20701213 is 31210702.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31210702 = 2 ⋅15605351.

It can be written as a sum of positive squares in 2 ways, for example, as 11471769 + 9229444 = 3387^2 + 3038^2 .

It is a cyclic number.

It is not a de Polignac number, because 20701213 - 2⁵ = 20701181 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 (20701243) 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 3 ways as a sum of consecutive naturals, for example, 796188 + ... + 796213.

It is an arithmetic number, because the mean of its divisors is an integer number (5573407).

Almost surely, 2^20701213 is an apocalyptic number.

It is an amenable number.

20701213 is a deficient number, since it is larger than the sum of its proper divisors (1592415).

20701213 is a wasteful number, since it uses less digits than its factorization.

20701213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592414.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 20701213 is about 4549.8585692305. The cubic root of 20701213 is about 274.5777011475.

Adding to 20701213 its reverse (31210702), we get a palindrome (51911915).

It can be divided in two parts, 207012 and 13, that added together give a square (207025 = 455²).

The spelling of 20701213 in words is "twenty million, seven hundred one thousand, two hundred thirteen".