20159641 has 8 divisors (see below), whose sum is σ = 20870144. Its totient is φ = 19452960.

The previous prime is 20159639. The next prime is 20159681. The reversal of 20159641 is 14695102.

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 20159641 - 2¹ = 20159639 is a prime.

It is a super-2 number, since 2×20159641² = 812822250497762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20159681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13456 + ... + 14878.

It is an arithmetic number, because the mean of its divisors is an integer number (2608768).

Almost surely, 2^20159641 is an apocalyptic number.

It is an amenable number.

20159641 is a deficient number, since it is larger than the sum of its proper divisors (710503).

20159641 is a wasteful number, since it uses less digits than its factorization.

20159641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 20159641 is about 4489.9488861233. The cubic root of 20159641 is about 272.1620691067.

The spelling of 20159641 in words is "twenty million, one hundred fifty-nine thousand, six hundred forty-one".