20689141 has 4 divisors (see below), whose sum is σ = 22569984. Its totient is φ = 18808300.

The previous prime is 20689139. The next prime is 20689159. The reversal of 20689141 is 14198602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20689141 - 2¹ = 20689139 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20689111) 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, 940405 + ... + 940426.

It is an arithmetic number, because the mean of its divisors is an integer number (5642496).

Almost surely, 2^20689141 is an apocalyptic number.

It is an amenable number.

20689141 is a deficient number, since it is larger than the sum of its proper divisors (1880843).

20689141 is a wasteful number, since it uses less digits than its factorization.

20689141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1880842.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 20689141 is about 4548.5317411226. The cubic root of 20689141 is about 274.5243170528.

The spelling of 20689141 in words is "twenty million, six hundred eighty-nine thousand, one hundred forty-one".