20207305 has 8 divisors (see below), whose sum is σ = 25675272. Its totient is φ = 15214848.

The previous prime is 20207303. The next prime is 20207309. The reversal of 20207305 is 50370202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 732736 + 19474569 = 856^2 + 4413^2 .

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 20207305 - 2¹ = 20207303 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20207303) 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, 118782 + ... + 118951.

It is an arithmetic number, because the mean of its divisors is an integer number (3209409).

Almost surely, 2^20207305 is an apocalyptic number.

It is an amenable number.

20207305 is a deficient number, since it is larger than the sum of its proper divisors (5467967).

20207305 is a wasteful number, since it uses less digits than its factorization.

20207305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237755.

The product of its (nonzero) digits is 420, while the sum is 19.

The square root of 20207305 is about 4495.2536079736. The cubic root of 20207305 is about 272.3763937343.

Adding to 20207305 its reverse (50370202), we get a palindrome (70577507).

The spelling of 20207305 in words is "twenty million, two hundred seven thousand, three hundred five".