20342631 has 8 divisors (see below), whose sum is σ = 27153280. Its totient is φ = 13546872.

The previous prime is 20342627. The next prime is 20342633. The reversal of 20342631 is 13624302.

It is a happy number.

20342631 is a nontrivial binomial coefficient, being equal to C(6379, 2).

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

It is not a de Polignac number, because 20342631 - 2² = 20342627 is a prime.

It is a super-2 number, since 2×20342631² = 827645272004322, 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 = 20342598 and 20342607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20342633) 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, 1 + ... + 6378.

It is an arithmetic number, because the mean of its divisors is an integer number (3394160).

Almost surely, 2^20342631 is an apocalyptic number.

20342631 is the 6378-th triangular number.

20342631 is a deficient number, since it is larger than the sum of its proper divisors (6810649).

20342631 is a wasteful number, since it uses less digits than its factorization.

20342631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7445.

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

The square root of 20342631 is about 4510.2805899412. The cubic root of 20342631 is about 272.9830659437.

Adding to 20342631 its reverse (13624302), we get a palindrome (33966933).

The spelling of 20342631 in words is "twenty million, three hundred forty-two thousand, six hundred thirty-one".