20520707 has 4 divisors (see below), whose sum is σ = 20542896. Its totient is φ = 20498520.

The previous prime is 20520701. The next prime is 20520743. The reversal of 20520707 is 70702502.

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 20520707 - 2⁴ = 20520691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20520701) 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, 9644 + ... + 11577.

It is an arithmetic number, because the mean of its divisors is an integer number (5135724).

Almost surely, 2^20520707 is an apocalyptic number.

20520707 is a deficient number, since it is larger than the sum of its proper divisors (22189).

20520707 is an equidigital number, since it uses as much as digits as its factorization.

20520707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22188.

The product of its (nonzero) digits is 980, while the sum is 23.

The square root of 20520707 is about 4529.9786975217. The cubic root of 20520707 is about 273.7773023095. Note that the first 3 decimals are identical.

The spelling of 20520707 in words is "twenty million, five hundred twenty thousand, seven hundred seven".