20740159 has 4 divisors (see below), whose sum is σ = 22625640. Its totient is φ = 18854680.

The previous prime is 20740127. The next prime is 20740163. The reversal of 20740159 is 95104702.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20740159 - 2⁵ = 20740127 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 (20740189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 942724 + ... + 942745.

It is an arithmetic number, because the mean of its divisors is an integer number (5656410).

Almost surely, 2^20740159 is an apocalyptic number.

20740159 is a deficient number, since it is larger than the sum of its proper divisors (1885481).

20740159 is a wasteful number, since it uses less digits than its factorization.

20740159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1885480.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 20740159 is about 4554.1364713851. The cubic root of 20740159 is about 274.7497845256.

The spelling of 20740159 in words is "twenty million, seven hundred forty thousand, one hundred fifty-nine".