20137631 has 8 divisors (see below), whose sum is σ = 21272064. Its totient is φ = 19033560.

The previous prime is 20137619. The next prime is 20137651. The reversal of 20137631 is 13673102.

It is a happy number.

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 20137631 - 2²² = 15943327 is a prime.

It is a super-2 number, since 2×20137631² = 811048364584322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 20137597 and 20137606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20137651) 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, 6221 + ... + 8886.

It is an arithmetic number, because the mean of its divisors is an integer number (2659008).

Almost surely, 2^20137631 is an apocalyptic number.

20137631 is a deficient number, since it is larger than the sum of its proper divisors (1134433).

20137631 is a wasteful number, since it uses less digits than its factorization.

20137631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15181.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 20137631 is about 4487.4971866286. The cubic root of 20137631 is about 272.0629855218.

The spelling of 20137631 in words is "twenty million, one hundred thirty-seven thousand, six hundred thirty-one".