20641707 has 12 divisors (see below), whose sum is σ = 30844320. Its totient is φ = 13286448.

The previous prime is 20641679. The next prime is 20641717. The reversal of 20641707 is 70714602.

It is not a de Polignac number, because 20641707 - 2²³ = 12253099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20641717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39283 + ... + 39804.

It is an arithmetic number, because the mean of its divisors is an integer number (2570360).

Almost surely, 2^20641707 is an apocalyptic number.

20641707 is a deficient number, since it is larger than the sum of its proper divisors (10202613).

20641707 is a wasteful number, since it uses less digits than its factorization.

20641707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79122 (or 79119 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 20641707 is about 4543.3145389682. The cubic root of 20641707 is about 274.3143558493.

The spelling of 20641707 in words is "twenty million, six hundred forty-one thousand, seven hundred seven".