20400303 has 32 divisors (see below), whose sum is σ = 34652160. Its totient is φ = 10366560.

The previous prime is 20400301. The next prime is 20400307. The reversal of 20400303 is 30300402.

It is not a de Polignac number, because 20400303 - 2¹ = 20400301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9918 + ... + 11796.

It is an arithmetic number, because the mean of its divisors is an integer number (1082880).

Almost surely, 2^20400303 is an apocalyptic number.

20400303 is a deficient number, since it is larger than the sum of its proper divisors (14251857).

20400303 is a wasteful number, since it uses less digits than its factorization.

20400303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1947.

The product of its (nonzero) digits is 72, while the sum is 12.

The square root of 20400303 is about 4516.6694587937. The cubic root of 20400303 is about 273.2407944059.

Adding to 20400303 its reverse (30300402), we get a palindrome (50700705).

Subtracting 20400303 from its reverse (30300402), we obtain a palindrome (9900099).

The spelling of 20400303 in words is "twenty million, four hundred thousand, three hundred three".