20503307 has 8 divisors (see below), whose sum is σ = 23089152. Its totient is φ = 18037800.

The previous prime is 20503279. The next prime is 20503313. The reversal of 20503307 is 70330502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20503307 - 2¹² = 20499211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20503367) 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 7 ways as a sum of consecutive naturals, for example, 29723 + ... + 30404.

It is an arithmetic number, because the mean of its divisors is an integer number (2886144).

Almost surely, 2^20503307 is an apocalyptic number.

20503307 is a deficient number, since it is larger than the sum of its proper divisors (2585845).

20503307 is a wasteful number, since it uses less digits than its factorization.

20503307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60169.

The product of its (nonzero) digits is 630, while the sum is 20.

The square root of 20503307 is about 4528.0577513985. The cubic root of 20503307 is about 273.6998996462.

Adding to 20503307 its reverse (70330502), we get a palindrome (90833809).

The spelling of 20503307 in words is "twenty million, five hundred three thousand, three hundred seven".