20213306 has 16 divisors (see below), whose sum is σ = 32201064. Its totient is φ = 9483264.

The previous prime is 20213293. The next prime is 20213309. The reversal of 20213306 is 60331202.

It can be written as a sum of positive squares in 4 ways, for example, as 19882681 + 330625 = 4459^2 + 575^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (20213309) 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 7 ways as a sum of consecutive naturals, for example, 14036 + ... + 15408.

Almost surely, 2^20213306 is an apocalyptic number.

20213306 is a deficient number, since it is larger than the sum of its proper divisors (11987758).

20213306 is a wasteful number, since it uses less digits than its factorization.

20213306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 20213306 is about 4495.9210402319. The cubic root of 20213306 is about 272.4033537695.

Adding to 20213306 its reverse (60331202), we get a palindrome (80544508).

The spelling of 20213306 in words is "twenty million, two hundred thirteen thousand, three hundred six".