20500403 has 8 divisors (see below), whose sum is σ = 25559040. Its totient is φ = 15974280.

The previous prime is 20500397. The next prime is 20500423. The reversal of 20500403 is 30400502.

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

It is not a de Polignac number, because 20500403 - 2⁴ = 20500387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20500423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133043 + ... + 133196.

It is an arithmetic number, because the mean of its divisors is an integer number (3194880).

Almost surely, 2^20500403 is an apocalyptic number.

20500403 is a deficient number, since it is larger than the sum of its proper divisors (5058637).

20500403 is a wasteful number, since it uses less digits than its factorization.

20500403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266257.

The product of its (nonzero) digits is 120, while the sum is 14.

The square root of 20500403 is about 4527.7370727550. The cubic root of 20500403 is about 273.6869771449.

Adding to 20500403 its reverse (30400502), we get a palindrome (50900905).

Subtracting 20500403 from its reverse (30400502), we obtain a palindrome (9900099).

The spelling of 20500403 in words is "twenty million, five hundred thousand, four hundred three".