20303497 has 4 divisors (see below), whose sum is σ = 20331076. Its totient is φ = 20275920.

The previous prime is 20303489. The next prime is 20303513. The reversal of 20303497 is 79430302.

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 15335056 + 4968441 = 3916^2 + 2229^2 .

It is a cyclic number.

It is not a de Polignac number, because 20303497 - 2³ = 20303489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20303447) 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 3 ways as a sum of consecutive naturals, for example, 12654 + ... + 14167.

It is an arithmetic number, because the mean of its divisors is an integer number (5082769).

Almost surely, 2^20303497 is an apocalyptic number.

It is an amenable number.

20303497 is a deficient number, since it is larger than the sum of its proper divisors (27579).

20303497 is an equidigital number, since it uses as much as digits as its factorization.

20303497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27578.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 20303497 is about 4505.9401904597. The cubic root of 20303497 is about 272.8079037923.

Adding to 20303497 its reverse (79430302), we get a palindrome (99733799).

The spelling of 20303497 in words is "twenty million, three hundred three thousand, four hundred ninety-seven".