20026403 has 4 divisors (see below), whose sum is σ = 20672448. Its totient is φ = 19380360.

The previous prime is 20026397. The next prime is 20026427. The reversal of 20026403 is 30462002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30462002 = 2 ⋅15231001.

It is a cyclic number.

It is not a de Polignac number, because 20026403 - 2⁴ = 20026387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20026463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322976 + ... + 323037.

It is an arithmetic number, because the mean of its divisors is an integer number (5168112).

Almost surely, 2^20026403 is an apocalyptic number.

20026403 is a deficient number, since it is larger than the sum of its proper divisors (646045).

20026403 is an equidigital number, since it uses as much as digits as its factorization.

20026403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646044.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20026403 is about 4475.0869265300. The cubic root of 20026403 is about 271.5611570822.

Adding to 20026403 its reverse (30462002), we get a palindrome (50488405).

The spelling of 20026403 in words is "twenty million, twenty-six thousand, four hundred three".