20040305 has 8 divisors (see below), whose sum is σ = 24877800. Its totient is φ = 15479296.

The previous prime is 20040301. The next prime is 20040311. The reversal of 20040305 is 50304002.

It can be written as a sum of positive squares in 4 ways, for example, as 1100401 + 18939904 = 1049^2 + 4352^2 .

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 20040305 - 2² = 20040301 is a prime.

It is a super-2 number, since 2×20040305² = 803227648986050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20040305.

It is not an unprimeable number, because it can be changed into a prime (20040301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68960 + ... + 69249.

It is an arithmetic number, because the mean of its divisors is an integer number (3109725).

Almost surely, 2^20040305 is an apocalyptic number.

It is an amenable number.

20040305 is a deficient number, since it is larger than the sum of its proper divisors (4837495).

20040305 is a wasteful number, since it uses less digits than its factorization.

20040305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138243.

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

The square root of 20040305 is about 4476.6399229779. The cubic root of 20040305 is about 271.6239803123.

Adding to 20040305 its reverse (50304002), we get a palindrome (70344307).

The spelling of 20040305 in words is "twenty million, forty thousand, three hundred five".