20100631 has 8 divisors (see below), whose sum is σ = 20744640. Its totient is φ = 19465728.

The previous prime is 20100629. The next prime is 20100673. The reversal of 20100631 is 13600102.

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 20100631 - 2¹ = 20100629 is a prime.

It is a super-2 number, since 2×20100631² = 808070733196322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100601) 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 7 ways as a sum of consecutive naturals, for example, 2355 + ... + 6763.

It is an arithmetic number, because the mean of its divisors is an integer number (2593080).

Almost surely, 2^20100631 is an apocalyptic number.

20100631 is a deficient number, since it is larger than the sum of its proper divisors (644009).

20100631 is an equidigital number, since it uses as much as digits as its factorization.

20100631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4553.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 20100631 is about 4483.3727259732. The cubic root of 20100631 is about 271.8962578349.

Adding to 20100631 its reverse (13600102), we get a palindrome (33700733).

The spelling of 20100631 in words is "twenty million, one hundred thousand, six hundred thirty-one".