20723503 has 2 divisors, whose sum is σ = 20723504. Its totient is φ = 20723502.

The previous prime is 20723489. The next prime is 20723513. The reversal of 20723503 is 30532702.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20723503 - 2⁹ = 20722991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20723513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10361751 + 10361752.

It is an arithmetic number, because the mean of its divisors is an integer number (10361752).

Almost surely, 2^20723503 is an apocalyptic number.

20723503 is a deficient number, since it is larger than the sum of its proper divisors (1).

20723503 is an equidigital number, since it uses as much as digits as its factorization.

20723503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 22.

The square root of 20723503 is about 4552.3074368940. The cubic root of 20723503 is about 274.6762161731.

The spelling of 20723503 in words is "twenty million, seven hundred twenty-three thousand, five hundred three".