20623693 has 2 divisors, whose sum is σ = 20623694. Its totient is φ = 20623692.

The previous prime is 20623643. The next prime is 20623717. The reversal of 20623693 is 39632602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15342889 + 5280804 = 3917^2 + 2298^2 .

It is a cyclic number.

It is not a de Polignac number, because 20623693 - 2⁹ = 20623181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20623643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10311846 + 10311847.

It is an arithmetic number, because the mean of its divisors is an integer number (10311847).

Almost surely, 2^20623693 is an apocalyptic number.

It is an amenable number.

20623693 is a deficient number, since it is larger than the sum of its proper divisors (1).

20623693 is an equidigital number, since it uses as much as digits as its factorization.

20623693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 20623693 is about 4541.3316329024. The cubic root of 20623693 is about 274.2345346571.

It can be divided in two parts, 20623 and 693, that added together give a square (21316 = 146²).

The spelling of 20623693 in words is "twenty million, six hundred twenty-three thousand, six hundred ninety-three".