20840707 has 2 divisors, whose sum is σ = 20840708. Its totient is φ = 20840706.

The previous prime is 20840683. The next prime is 20840717. The reversal of 20840707 is 70704802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20840707 - 2⁷ = 20840579 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20840717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10420353 + 10420354.

It is an arithmetic number, because the mean of its divisors is an integer number (10420354).

Almost surely, 2^20840707 is an apocalyptic number.

20840707 is a deficient number, since it is larger than the sum of its proper divisors (1).

20840707 is an equidigital number, since it uses as much as digits as its factorization.

20840707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 20840707 is about 4565.1623191295. The cubic root of 20840707 is about 275.1930633265.

The spelling of 20840707 in words is "twenty million, eight hundred forty thousand, seven hundred seven".