20212305 has 8 divisors (see below), whose sum is σ = 32339712. Its totient is φ = 10779888.

The previous prime is 20212271. The next prime is 20212319. The reversal of 20212305 is 50321202.

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

It is not a de Polignac number, because 20212305 - 2¹¹ = 20210257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 1347487 = 20212305 / (2 + 0 + 2 + 1 + 2 + 3 + 0 + 5).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 673729 + ... + 673758.

It is an arithmetic number, because the mean of its divisors is an integer number (4042464).

Almost surely, 2^20212305 is an apocalyptic number.

It is an amenable number.

20212305 is a deficient number, since it is larger than the sum of its proper divisors (12127407).

20212305 is a wasteful number, since it uses less digits than its factorization.

20212305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347495.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 20212305 is about 4495.8097157242. The cubic root of 20212305 is about 272.3988570574.

Adding to 20212305 its reverse (50321202), we get a palindrome (70533507).

The spelling of 20212305 in words is "twenty million, two hundred twelve thousand, three hundred five".