20003405 has 8 divisors (see below), whose sum is σ = 24041472. Its totient is φ = 15977808.

The previous prime is 20003393. The next prime is 20003443. The reversal of 20003405 is 50430002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20003405 - 2⁸ = 20003149 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20003405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 884 + ... + 6386.

It is an arithmetic number, because the mean of its divisors is an integer number (3005184).

Almost surely, 2^20003405 is an apocalyptic number.

It is an amenable number.

20003405 is a deficient number, since it is larger than the sum of its proper divisors (4038067).

20003405 is an equidigital number, since it uses as much as digits as its factorization.

20003405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6235.

The product of its (nonzero) digits is 120, while the sum is 14.

The square root of 20003405 is about 4472.5166293710. The cubic root of 20003405 is about 271.4571651054.

Adding to 20003405 its reverse (50430002), we get a palindrome (70433407).

The spelling of 20003405 in words is "twenty million, three thousand, four hundred five".