20352641 has 4 divisors (see below), whose sum is σ = 20372292. Its totient is φ = 20332992.

The previous prime is 20352617. The next prime is 20352643. The reversal of 20352641 is 14625302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3254416 + 17098225 = 1804^2 + 4135^2 .

It is a cyclic number.

It is not a de Polignac number, because 20352641 - 2¹⁴ = 20336257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20352643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8180 + ... + 10373.

It is an arithmetic number, because the mean of its divisors is an integer number (5093073).

Almost surely, 2^20352641 is an apocalyptic number.

It is an amenable number.

20352641 is a deficient number, since it is larger than the sum of its proper divisors (19651).

20352641 is a wasteful number, since it uses less digits than its factorization.

20352641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19650.

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

The square root of 20352641 is about 4511.3901405221. The cubic root of 20352641 is about 273.0278342008.

Adding to 20352641 its reverse (14625302), we get a palindrome (34977943).

The spelling of 20352641 in words is "twenty million, three hundred fifty-two thousand, six hundred forty-one".