20159138 has 8 divisors (see below), whose sum is σ = 30295632. Its totient is φ = 10060596.

The previous prime is 20159137. The next prime is 20159177. The reversal of 20159138 is 83195102.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20159138.

It is not an unprimeable number, because it can be changed into a prime (20159137) 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, 8120 + ... + 10307.

It is an arithmetic number, because the mean of its divisors is an integer number (3786954).

Almost surely, 2^20159138 is an apocalyptic number.

20159138 is a deficient number, since it is larger than the sum of its proper divisors (10136494).

20159138 is a wasteful number, since it uses less digits than its factorization.

20159138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18976.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 20159138 is about 4489.8928717732. The cubic root of 20159138 is about 272.1598055303.

The spelling of 20159138 in words is "twenty million, one hundred fifty-nine thousand, one hundred thirty-eight".