20742707 has 2 divisors, whose sum is σ = 20742708. Its totient is φ = 20742706.

The previous prime is 20742697. The next prime is 20742713. The reversal of 20742707 is 70724702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20742707 - 2⁶ = 20742643 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20742707.

It is not a weakly prime, because it can be changed into another prime (20742797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10371353 + 10371354.

It is an arithmetic number, because the mean of its divisors is an integer number (10371354).

Almost surely, 2^20742707 is an apocalyptic number.

20742707 is a deficient number, since it is larger than the sum of its proper divisors (1).

20742707 is an equidigital number, since it uses as much as digits as its factorization.

20742707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5488, while the sum is 29.

The square root of 20742707 is about 4554.4162084728. The cubic root of 20742707 is about 274.7610353841.

The spelling of 20742707 in words is "twenty million, seven hundred forty-two thousand, seven hundred seven".