20203445 has 16 divisors (see below), whose sum is σ = 24857280. Its totient is φ = 15759744.

The previous prime is 20203427. The next prime is 20203457. The reversal of 20203445 is 54430202.

It is a cyclic number.

It is not a de Polignac number, because 20203445 - 2²² = 16009141 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 36662 + ... + 37208.

It is an arithmetic number, because the mean of its divisors is an integer number (1553580).

Almost surely, 2^20203445 is an apocalyptic number.

It is an amenable number.

20203445 is a deficient number, since it is larger than the sum of its proper divisors (4653835).

20203445 is an equidigital number, since it uses as much as digits as its factorization.

20203445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 20203445 is about 4494.8242457297. The cubic root of 20203445 is about 272.3590495143.

Adding to 20203445 its reverse (54430202), we get a palindrome (74633647).

The spelling of 20203445 in words is "twenty million, two hundred three thousand, four hundred forty-five".