20847707 has 2 divisors, whose sum is σ = 20847708. Its totient is φ = 20847706.

The previous prime is 20847703. The next prime is 20847727. The reversal of 20847707 is 70774802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20847707 - 2² = 20847703 is a prime.

It is not a weakly prime, because it can be changed into another prime (20847703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10423853 + 10423854.

It is an arithmetic number, because the mean of its divisors is an integer number (10423854).

Almost surely, 2^20847707 is an apocalyptic number.

20847707 is a deficient number, since it is larger than the sum of its proper divisors (1).

20847707 is an equidigital number, since it uses as much as digits as its factorization.

20847707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21952, while the sum is 35.

The square root of 20847707 is about 4565.9289306777. The cubic root of 20847707 is about 275.2238705957.

The spelling of 20847707 in words is "twenty million, eight hundred forty-seven thousand, seven hundred seven".