20641235 has 16 divisors (see below), whose sum is σ = 25989120. Its totient is φ = 15708000.

The previous prime is 20641223. The next prime is 20641253. The reversal of 20641235 is 53214602.

It is not a de Polignac number, because 20641235 - 2¹⁶ = 20575699 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a self number, because there is not a number n which added to its sum of digits gives 20641235.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27110 + ... + 27860.

It is an arithmetic number, because the mean of its divisors is an integer number (1624320).

Almost surely, 2^20641235 is an apocalyptic number.

20641235 is a deficient number, since it is larger than the sum of its proper divisors (5347885).

20641235 is a wasteful number, since it uses less digits than its factorization.

20641235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20641235 is about 4543.2625942157. The cubic root of 20641235 is about 274.3122649795.

Adding to 20641235 its reverse (53214602), we get a palindrome (73855837).

The spelling of 20641235 in words is "twenty million, six hundred forty-one thousand, two hundred thirty-five".