20367631 has 4 divisors (see below), whose sum is σ = 20554600. Its totient is φ = 20180664.

The previous prime is 20367629. The next prime is 20367637. The reversal of 20367631 is 13676302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13676302 = 2 ⋅6838151.

It is a cyclic number.

It is not a de Polignac number, because 20367631 - 2¹ = 20367629 is a prime.

It is a super-2 number, since 2×20367631² = 829680785104322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20367631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20367637) 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, 93321 + ... + 93538.

It is an arithmetic number, because the mean of its divisors is an integer number (5138650).

Almost surely, 2^20367631 is an apocalyptic number.

20367631 is a deficient number, since it is larger than the sum of its proper divisors (186969).

20367631 is a wasteful number, since it uses less digits than its factorization.

20367631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186968.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 20367631 is about 4513.0511851740. The cubic root of 20367631 is about 273.0948473364.

The spelling of 20367631 in words is "twenty million, three hundred sixty-seven thousand, six hundred thirty-one".