20641071 has 16 divisors (see below), whose sum is σ = 30993408. Its totient is φ = 12105600.

The previous prime is 20641063. The next prime is 20641073. The reversal of 20641071 is 17014602.

It is not a de Polignac number, because 20641071 - 2³ = 20641063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20641073) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9066 + ... + 11111.

It is an arithmetic number, because the mean of its divisors is an integer number (1937088).

Almost surely, 2^20641071 is an apocalyptic number.

20641071 is a deficient number, since it is larger than the sum of its proper divisors (10352337).

20641071 is a wasteful number, since it uses less digits than its factorization.

20641071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20222.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 20641071 is about 4543.2445454763. The cubic root of 20641071 is about 274.3115384834.

Adding to 20641071 its reverse (17014602), we get a palindrome (37655673).

The spelling of 20641071 in words is "twenty million, six hundred forty-one thousand, seventy-one".