20723723 has 2 divisors, whose sum is σ = 20723724. Its totient is φ = 20723722.

The previous prime is 20723711. The next prime is 20723741. The reversal of 20723723 is 32732702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20723723 - 2⁴ = 20723707 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20723692 and 20723701.

It is not a weakly prime, because it can be changed into another prime (20723743) 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, 10361861 + 10361862.

It is an arithmetic number, because the mean of its divisors is an integer number (10361862).

Almost surely, 2^20723723 is an apocalyptic number.

20723723 is a deficient number, since it is larger than the sum of its proper divisors (1).

20723723 is an equidigital number, since it uses as much as digits as its factorization.

20723723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 26.

The square root of 20723723 is about 4552.3316004000. The cubic root of 20723723 is about 274.6771881541.

The spelling of 20723723 in words is "twenty million, seven hundred twenty-three thousand, seven hundred twenty-three".