20500161 has 8 divisors (see below), whose sum is σ = 29818464. Its totient is φ = 12424320.

The previous prime is 20500159. The next prime is 20500163. The reversal of 20500161 is 16100502.

It is an interprime number because it is at equal distance from previous prime (20500159) and next prime (20500163).

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

It is not a de Polignac number, because 20500161 - 2¹ = 20500159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20500161.

It is not an unprimeable number, because it can be changed into a prime (20500163) 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, 310576 + ... + 310641.

It is an arithmetic number, because the mean of its divisors is an integer number (3727308).

Almost surely, 2^20500161 is an apocalyptic number.

It is an amenable number.

20500161 is a deficient number, since it is larger than the sum of its proper divisors (9318303).

20500161 is a wasteful number, since it uses less digits than its factorization.

20500161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621231.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 20500161 is about 4527.7103485095. The cubic root of 20500161 is about 273.6859002147.

Adding to 20500161 its reverse (16100502), we get a palindrome (36600663).

The spelling of 20500161 in words is "twenty million, five hundred thousand, one hundred sixty-one".