20724707 has 2 divisors, whose sum is σ = 20724708. Its totient is φ = 20724706.

The previous prime is 20724677. The next prime is 20724719. The reversal of 20724707 is 70742702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20724707 - 2¹⁰ = 20723683 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 20724707.

It is not a weakly prime, because it can be changed into another prime (20724727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10362353 + 10362354.

It is an arithmetic number, because the mean of its divisors is an integer number (10362354).

Almost surely, 2^20724707 is an apocalyptic number.

20724707 is a deficient number, since it is larger than the sum of its proper divisors (1).

20724707 is an equidigital number, since it uses as much as digits as its factorization.

20724707 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 20724707 is about 4552.4396756025. The cubic root of 20724707 is about 274.6815354759.

The spelling of 20724707 in words is "twenty million, seven hundred twenty-four thousand, seven hundred seven".