20631163 has 8 divisors (see below), whose sum is σ = 24216032. Its totient is φ = 17205696.

The previous prime is 20631157. The next prime is 20631173. The reversal of 20631163 is 36113602.

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

It is a cyclic number.

It is not a de Polignac number, because 20631163 - 2¹⁷ = 20500091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20631103) 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, 39570 + ... + 40087.

It is an arithmetic number, because the mean of its divisors is an integer number (3027004).

Almost surely, 2^20631163 is an apocalyptic number.

20631163 is a deficient number, since it is larger than the sum of its proper divisors (3584869).

20631163 is an equidigital number, since it uses as much as digits as its factorization.

20631163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79701.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 20631163 is about 4542.1540044345. The cubic root of 20631163 is about 274.2676403460.

Adding to 20631163 its reverse (36113602), we get a palindrome (56744765).

The spelling of 20631163 in words is "twenty million, six hundred thirty-one thousand, one hundred sixty-three".