20305707 has 4 divisors (see below), whose sum is σ = 27074280. Its totient is φ = 13537136.

The previous prime is 20305693. The next prime is 20305777. The reversal of 20305707 is 70750302.

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

It is a cyclic number.

It is not a de Polignac number, because 20305707 - 2⁶ = 20305643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20305777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3384282 + ... + 3384287.

It is an arithmetic number, because the mean of its divisors is an integer number (6768570).

Almost surely, 2^20305707 is an apocalyptic number.

20305707 is a deficient number, since it is larger than the sum of its proper divisors (6768573).

20305707 is an equidigital number, since it uses as much as digits as its factorization.

20305707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6768572.

The product of its (nonzero) digits is 1470, while the sum is 24.

The square root of 20305707 is about 4506.1854156259. The cubic root of 20305707 is about 272.8178016536.

It can be divided in two parts, 20305 and 707, that added together give a palindrome (21012).

The spelling of 20305707 in words is "twenty million, three hundred five thousand, seven hundred seven".