20203245 has 24 divisors (see below), whose sum is σ = 35170200. Its totient is φ = 10728576.

The previous prime is 20203243. The next prime is 20203273. The reversal of 20203245 is 54230202.

It can be written as a sum of positive squares in 4 ways, for example, as 114921 + 20088324 = 339^2 + 4482^2 .

It is not a de Polignac number, because 20203245 - 2¹ = 20203243 is a prime.

It is a super-2 number, since 2×20203245² = 816342217060050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20203243) 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 23 ways as a sum of consecutive naturals, for example, 11271 + ... + 12939.

It is an arithmetic number, because the mean of its divisors is an integer number (1465425).

Almost surely, 2^20203245 is an apocalyptic number.

It is an amenable number.

20203245 is a deficient number, since it is larger than the sum of its proper divisors (14966955).

20203245 is a wasteful number, since it uses less digits than its factorization.

20203245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949 (or 1946 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 20203245 is about 4494.8019978638. The cubic root of 20203245 is about 272.3581507899.

Adding to 20203245 its reverse (54230202), we get a palindrome (74433447).

The spelling of 20203245 in words is "twenty million, two hundred three thousand, two hundred forty-five".