20678423 has 2 divisors, whose sum is σ = 20678424. Its totient is φ = 20678422.

The previous prime is 20678417. The next prime is 20678429. The reversal of 20678423 is 32487602.

It is a balanced prime because it is at equal distance from previous prime (20678417) and next prime (20678429).

It is a cyclic number.

It is not a de Polignac number, because 20678423 - 2¹² = 20674327 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20678423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20678429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10339211 + 10339212.

It is an arithmetic number, because the mean of its divisors is an integer number (10339212).

Almost surely, 2^20678423 is an apocalyptic number.

20678423 is a deficient number, since it is larger than the sum of its proper divisors (1).

20678423 is an equidigital number, since it uses as much as digits as its factorization.

20678423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 20678423 is about 4547.3534061034. The cubic root of 20678423 is about 274.4769031322.

The spelling of 20678423 in words is "twenty million, six hundred seventy-eight thousand, four hundred twenty-three".