20662213 has 32 divisors (see below), whose sum is σ = 25804800. Its totient is φ = 16286400.

The previous prime is 20662183. The next prime is 20662241. The reversal of 20662213 is 31226602.

It is a happy number.

It is not a de Polignac number, because 20662213 - 2¹³ = 20654021 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 (20662273) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 261508 + ... + 261586.

It is an arithmetic number, because the mean of its divisors is an integer number (806400).

Almost surely, 2^20662213 is an apocalyptic number.

It is an amenable number.

20662213 is a deficient number, since it is larger than the sum of its proper divisors (5142587).

20662213 is a wasteful number, since it uses less digits than its factorization.

20662213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 20662213 is about 4545.5707012431. The cubic root of 20662213 is about 274.4051627531.

Adding to 20662213 its reverse (31226602), we get a palindrome (51888815).

The spelling of 20662213 in words is "twenty million, six hundred sixty-two thousand, two hundred thirteen".