20701823 has 2 divisors, whose sum is σ = 20701824. Its totient is φ = 20701822.

The previous prime is 20701819. The next prime is 20701841. The reversal of 20701823 is 32810702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20701823 - 2² = 20701819 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20701123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10350911 + 10350912.

It is an arithmetic number, because the mean of its divisors is an integer number (10350912).

Almost surely, 2^20701823 is an apocalyptic number.

20701823 is a deficient number, since it is larger than the sum of its proper divisors (1).

20701823 is an equidigital number, since it uses as much as digits as its factorization.

20701823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 20701823 is about 4549.9256037874. The cubic root of 20701823 is about 274.5803981031.

The spelling of 20701823 in words is "twenty million, seven hundred one thousand, eight hundred twenty-three".