20540403 has 48 divisors (see below), whose sum is σ = 35380800. Its totient is φ = 11354112.

The previous prime is 20540393. The next prime is 20540413. The reversal of 20540403 is 30404502.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20540393) and next prime (20540413).

It is not a de Polignac number, because 20540403 - 2⁶ = 20540339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20540413) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 45523 + ... + 45971.

It is an arithmetic number, because the mean of its divisors is an integer number (737100).

Almost surely, 2^20540403 is an apocalyptic number.

20540403 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20540403 is a deficient number, since it is larger than the sum of its proper divisors (14840397).

20540403 is a wasteful number, since it uses less digits than its factorization.

20540403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508 (or 505 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 20540403 is about 4532.1521377818. The cubic root of 20540403 is about 273.8648657881.

Adding to 20540403 its reverse (30404502), we get a palindrome (50944905).

The spelling of 20540403 in words is "twenty million, five hundred forty thousand, four hundred three".