20036631 has 4 divisors (see below), whose sum is σ = 26715512. Its totient is φ = 13357752.

The previous prime is 20036629. The next prime is 20036677. The reversal of 20036631 is 13663002.

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

It is not a de Polignac number, because 20036631 - 2¹ = 20036629 is a prime.

It is a super-2 number, since 2×20036631² = 802933163660322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20036598 and 20036607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20036131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3339436 + ... + 3339441.

It is an arithmetic number, because the mean of its divisors is an integer number (6678878).

Almost surely, 2^20036631 is an apocalyptic number.

20036631 is a deficient number, since it is larger than the sum of its proper divisors (6678881).

20036631 is an equidigital number, since it uses as much as digits as its factorization.

20036631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6678880.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 20036631 is about 4476.2295517545. The cubic root of 20036631 is about 271.6073803072.

Adding to 20036631 its reverse (13663002), we get a palindrome (33699633).

The spelling of 20036631 in words is "twenty million, thirty-six thousand, six hundred thirty-one".