20663707 has 2 divisors, whose sum is σ = 20663708. Its totient is φ = 20663706.

The previous prime is 20663677. The next prime is 20663719. The reversal of 20663707 is 70736602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20663707 is a prime.

It is not a weakly prime, because it can be changed into another prime (20663737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10331853 + 10331854.

It is an arithmetic number, because the mean of its divisors is an integer number (10331854).

Almost surely, 2^20663707 is an apocalyptic number.

20663707 is a deficient number, since it is larger than the sum of its proper divisors (1).

20663707 is an equidigital number, since it uses as much as digits as its factorization.

20663707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 31.

The square root of 20663707 is about 4545.7350340731. The cubic root of 20663707 is about 274.4117762982.

The spelling of 20663707 in words is "twenty million, six hundred sixty-three thousand, seven hundred seven".