20203313 has 4 divisors (see below), whose sum is σ = 21757428. Its totient is φ = 18649200.

The previous prime is 20203307. The next prime is 20203349. The reversal of 20203313 is 31330202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5326864 + 14876449 = 2308^2 + 3857^2 .

It is a cyclic number.

It is not a de Polignac number, because 20203313 - 2⁴ = 20203297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20203303) 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 3 ways as a sum of consecutive naturals, for example, 777038 + ... + 777063.

It is an arithmetic number, because the mean of its divisors is an integer number (5439357).

Almost surely, 2^20203313 is an apocalyptic number.

It is an amenable number.

20203313 is a deficient number, since it is larger than the sum of its proper divisors (1554115).

20203313 is a wasteful number, since it uses less digits than its factorization.

20203313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1554114.

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 20203313 is about 4494.8095621505. The cubic root of 20203313 is about 272.3584563569.

Adding to 20203313 its reverse (31330202), we get a palindrome (51533515).

The spelling of 20203313 in words is "twenty million, two hundred three thousand, three hundred thirteen".