20631023 has 16 divisors (see below), whose sum is σ = 24821760. Its totient is φ = 16765056.

The previous prime is 20631019. The next prime is 20631031. The reversal of 20631023 is 32013602.

It is not a de Polignac number, because 20631023 - 2² = 20631019 is a prime.

It is a super-2 number, since 2×20631023² = 851278220053058, 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 = 20630992 and 20631010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20631043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19943 + ... + 20951.

It is an arithmetic number, because the mean of its divisors is an integer number (1551360).

Almost surely, 2^20631023 is an apocalyptic number.

20631023 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20631023 is a deficient number, since it is larger than the sum of its proper divisors (4190737).

20631023 is a wasteful number, since it uses less digits than its factorization.

20631023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 20631023 is about 4542.1385932180. The cubic root of 20631023 is about 274.2670199648.

Adding to 20631023 its reverse (32013602), we get a palindrome (52644625).

The spelling of 20631023 in words is "twenty million, six hundred thirty-one thousand, twenty-three".