20391203 has 6 divisors (see below), whose sum is σ = 23720436. Its totient is φ = 17478132.

The previous prime is 20391197. The next prime is 20391221. The reversal of 20391203 is 30219302.

It is not a de Polignac number, because 20391203 - 2⁶ = 20391139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20391103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 208025 + ... + 208122.

It is an arithmetic number, because the mean of its divisors is an integer number (3953406).

Almost surely, 2^20391203 is an apocalyptic number.

20391203 is a deficient number, since it is larger than the sum of its proper divisors (3329233).

20391203 is an equidigital number, since it uses as much as digits as its factorization.

20391203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416161 (or 416154 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 20391203 is about 4515.6619669767. The cubic root of 20391203 is about 273.2001600251.

The spelling of 20391203 in words is "twenty million, three hundred ninety-one thousand, two hundred three".