20161559 has 8 divisors (see below), whose sum is σ = 22589328. Its totient is φ = 17832960.

The previous prime is 20161553. The next prime is 20161567. The reversal of 20161559 is 95516102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20161559 is a prime.

It is a super-2 number, since 2×20161559² = 812976922620962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20161553) 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, 24362 + ... + 25175.

It is an arithmetic number, because the mean of its divisors is an integer number (2823666).

Almost surely, 2^20161559 is an apocalyptic number.

20161559 is a deficient number, since it is larger than the sum of its proper divisors (2427769).

20161559 is a wasteful number, since it uses less digits than its factorization.

20161559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49585.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 20161559 is about 4490.1624692209. The cubic root of 20161559 is about 272.1707000523.

The spelling of 20161559 in words is "twenty million, one hundred sixty-one thousand, five hundred fifty-nine".