20001559 has 8 divisors (see below), whose sum is σ = 20921472. Its totient is φ = 19085880.

The previous prime is 20001557. The next prime is 20001613. The reversal of 20001559 is 95510002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20001559 - 2¹ = 20001557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12372 + ... + 13894.

It is an arithmetic number, because the mean of its divisors is an integer number (2615184).

Almost surely, 2^20001559 is an apocalyptic number.

20001559 is a deficient number, since it is larger than the sum of its proper divisors (919913).

20001559 is a wasteful number, since it uses less digits than its factorization.

20001559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2117.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 20001559 is about 4472.3102531019. The cubic root of 20001559 is about 271.4488144380.

The spelling of 20001559 in words is "twenty million, one thousand, five hundred fifty-nine".