20168403 has 4 divisors (see below), whose sum is σ = 26891208. Its totient is φ = 13445600.

The previous prime is 20168389. The next prime is 20168411. The reversal of 20168403 is 30486102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20168403 - 2⁵ = 20168371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20168303) 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, 3361398 + ... + 3361403.

It is an arithmetic number, because the mean of its divisors is an integer number (6722802).

Almost surely, 2^20168403 is an apocalyptic number.

20168403 is a deficient number, since it is larger than the sum of its proper divisors (6722805).

20168403 is an equidigital number, since it uses as much as digits as its factorization.

20168403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6722804.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 20168403 is about 4490.9245150637. The cubic root of 20168403 is about 272.2014933975.

The spelling of 20168403 in words is "twenty million, one hundred sixty-eight thousand, four hundred three".