20662423 has 2 divisors, whose sum is σ = 20662424. Its totient is φ = 20662422.

The previous prime is 20662393. The next prime is 20662451. The reversal of 20662423 is 32426602.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20662423 - 2²¹ = 18565271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20662493) 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, 10331211 + 10331212.

It is an arithmetic number, because the mean of its divisors is an integer number (10331212).

Almost surely, 2^20662423 is an apocalyptic number.

20662423 is a deficient number, since it is larger than the sum of its proper divisors (1).

20662423 is an equidigital number, since it uses as much as digits as its factorization.

20662423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 20662423 is about 4545.5938005942. The cubic root of 20662423 is about 274.4060923871.

It can be divided in two parts, 2066 and 2423, that added together give a square (4489 = 67²).

The spelling of 20662423 in words is "twenty million, six hundred sixty-two thousand, four hundred twenty-three".