20631243 has 8 divisors (see below), whose sum is σ = 27919168. Its totient is φ = 13548744.

The previous prime is 20631229. The next prime is 20631263. The reversal of 20631243 is 34213602.

It is a happy number.

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

It is not a de Polignac number, because 20631243 - 2¹³ = 20623051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20631203) 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, 51121 + ... + 51522.

It is an arithmetic number, because the mean of its divisors is an integer number (3489896).

Almost surely, 2^20631243 is an apocalyptic number.

20631243 is a deficient number, since it is larger than the sum of its proper divisors (7287925).

20631243 is a wasteful number, since it uses less digits than its factorization.

20631243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102713.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 20631243 is about 4542.1628108204. The cubic root of 20631243 is about 274.2679948483.

Adding to 20631243 its reverse (34213602), we get a palindrome (54844845).

The spelling of 20631243 in words is "twenty million, six hundred thirty-one thousand, two hundred forty-three".