20042559 has 10 divisors (see below), whose sum is σ = 29940240. Its totient is φ = 13361652.

The previous prime is 20042557. The next prime is 20042573. The reversal of 20042559 is 95524002.

It is not a de Polignac number, because 20042559 - 2¹ = 20042557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20042551) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 123639 + ... + 123800.

It is an arithmetic number, because the mean of its divisors is an integer number (2994024).

Almost surely, 2^20042559 is an apocalyptic number.

20042559 is a deficient number, since it is larger than the sum of its proper divisors (9897681).

20042559 is an equidigital number, since it uses as much as digits as its factorization.

20042559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247451 (or 247442 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 20042559 is about 4476.8916672173. The cubic root of 20042559 is about 271.6341634158.

The spelling of 20042559 in words is "twenty million, forty-two thousand, five hundred fifty-nine".