20703213 has 6 divisors (see below), whose sum is σ = 29904654. Its totient is φ = 13802136.

The previous prime is 20703211. The next prime is 20703223. The reversal of 20703213 is 31230702.

It can be written as a sum of positive squares in only one way, i.e., 13638249 + 7064964 = 3693^2 + 2658^2 .

It is not a de Polignac number, because 20703213 - 2¹ = 20703211 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20703211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1150170 + ... + 1150187.

It is an arithmetic number, because the mean of its divisors is an integer number (4984109).

Almost surely, 2^20703213 is an apocalyptic number.

It is an amenable number.

20703213 is a deficient number, since it is larger than the sum of its proper divisors (9201441).

20703213 is a wasteful number, since it uses less digits than its factorization.

20703213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2300363 (or 2300360 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 20703213 is about 4550.0783509737. The cubic root of 20703213 is about 274.5865434268.

Adding to 20703213 its reverse (31230702), we get a palindrome (51933915).

The spelling of 20703213 in words is "twenty million, seven hundred three thousand, two hundred thirteen".