20942723 has 2 divisors, whose sum is σ = 20942724. Its totient is φ = 20942722.

The previous prime is 20942717. The next prime is 20942741. The reversal of 20942723 is 32724902.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20942723 is a prime.

It is not a weakly prime, because it can be changed into another prime (20942783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10471361 + 10471362.

It is an arithmetic number, because the mean of its divisors is an integer number (10471362).

Almost surely, 2^20942723 is an apocalyptic number.

20942723 is a deficient number, since it is larger than the sum of its proper divisors (1).

20942723 is an equidigital number, since it uses as much as digits as its factorization.

20942723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 20942723 is about 4576.3219947901. The cubic root of 20942723 is about 275.6413592476.

The spelling of 20942723 in words is "twenty million, nine hundred forty-two thousand, seven hundred twenty-three".