20620505 has 8 divisors (see below), whose sum is σ = 24976512. Its totient is φ = 16341808.

The previous prime is 20620493. The next prime is 20620513. The reversal of 20620505 is 50502602.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20620505 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18737 + ... + 19806.

It is an arithmetic number, because the mean of its divisors is an integer number (3122064).

Almost surely, 2^20620505 is an apocalyptic number.

It is an amenable number.

20620505 is a deficient number, since it is larger than the sum of its proper divisors (4356007).

20620505 is a wasteful number, since it uses less digits than its factorization.

20620505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38655.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20620505 is about 4540.9806209672. The cubic root of 20620505 is about 274.2204035839.

The spelling of 20620505 in words is "twenty million, six hundred twenty thousand, five hundred five".