20149559 has 2 divisors, whose sum is σ = 20149560. Its totient is φ = 20149558.

The previous prime is 20149553. The next prime is 20149589. The reversal of 20149559 is 95594102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20149559 - 2⁴ = 20149543 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20149553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10074779 + 10074780.

It is an arithmetic number, because the mean of its divisors is an integer number (10074780).

Almost surely, 2^20149559 is an apocalyptic number.

20149559 is a deficient number, since it is larger than the sum of its proper divisors (1).

20149559 is an equidigital number, since it uses as much as digits as its factorization.

20149559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 20149559 is about 4488.8260157863. The cubic root of 20149559 is about 272.1166913884.

The spelling of 20149559 in words is "twenty million, one hundred forty-nine thousand, five hundred fifty-nine".