20403065 has 4 divisors (see below), whose sum is σ = 24483684. Its totient is φ = 16322448.

The previous prime is 20403023. The next prime is 20403073. The reversal of 20403065 is 56030402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2493241 + 17909824 = 1579^2 + 4232^2 .

It is a cyclic number.

It is not a de Polignac number, because 20403065 - 2¹⁶ = 20337529 is a prime.

It is a super-2 number, since 2×20403065² = 832570122788450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2040302 + ... + 2040311.

It is an arithmetic number, because the mean of its divisors is an integer number (6120921).

Almost surely, 2^20403065 is an apocalyptic number.

It is an amenable number.

20403065 is a deficient number, since it is larger than the sum of its proper divisors (4080619).

20403065 is an equidigital number, since it uses as much as digits as its factorization.

20403065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4080618.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20403065 is about 4516.9752047139. The cubic root of 20403065 is about 273.2531252197.

Adding to 20403065 its reverse (56030402), we get a palindrome (76433467).

The spelling of 20403065 in words is "twenty million, four hundred three thousand, sixty-five".