20631001 has 4 divisors (see below), whose sum is σ = 20862900. Its totient is φ = 20399104.

The previous prime is 20630999. The next prime is 20631011. The reversal of 20631001 is 10013602.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10896601 + 9734400 = 3301^2 + 3120^2 .

It is a cyclic number.

It is not a de Polignac number, because 20631001 - 2¹ = 20630999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20631011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115816 + ... + 115993.

It is an arithmetic number, because the mean of its divisors is an integer number (5215725).

Almost surely, 2^20631001 is an apocalyptic number.

It is an amenable number.

20631001 is a deficient number, since it is larger than the sum of its proper divisors (231899).

20631001 is an equidigital number, since it uses as much as digits as its factorization.

20631001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231898.

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

The square root of 20631001 is about 4542.1361714506. The cubic root of 20631001 is about 274.2669224761.

Adding to 20631001 its reverse (10013602), we get a palindrome (30644603).

The spelling of 20631001 in words is "twenty million, six hundred thirty-one thousand, one".