20675399 has 2 divisors, whose sum is σ = 20675400. Its totient is φ = 20675398.

The previous prime is 20675381. The next prime is 20675423. The reversal of 20675399 is 99357602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20675399 - 2⁸ = 20675143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20675309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10337699 + 10337700.

It is an arithmetic number, because the mean of its divisors is an integer number (10337700).

Almost surely, 2^20675399 is an apocalyptic number.

20675399 is a deficient number, since it is larger than the sum of its proper divisors (1).

20675399 is an equidigital number, since it uses as much as digits as its factorization.

20675399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 41.

The square root of 20675399 is about 4547.0208928484. The cubic root of 20675399 is about 274.4635227015.

The spelling of 20675399 in words is "twenty million, six hundred seventy-five thousand, three hundred ninety-nine".