20218713 has 16 divisors (see below), whose sum is σ = 28015680. Its totient is φ = 12954816.

The previous prime is 20218711. The next prime is 20218721. The reversal of 20218713 is 31781202.

It is not a de Polignac number, because 20218713 - 2¹ = 20218711 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20218711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26331 + ... + 27087.

It is an arithmetic number, because the mean of its divisors is an integer number (1750980).

Almost surely, 2^20218713 is an apocalyptic number.

It is an amenable number.

20218713 is a deficient number, since it is larger than the sum of its proper divisors (7796967).

20218713 is a wasteful number, since it uses less digits than its factorization.

20218713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 20218713 is about 4496.5223228624. The cubic root of 20218713 is about 272.4276406365.

Adding to 20218713 its reverse (31781202), we get a palindrome (51999915).

It can be divided in two parts, 202 and 18713, that added together give a triangular number (18915 = T₁₉₄).

The spelling of 20218713 in words is "twenty million, two hundred eighteen thousand, seven hundred thirteen".