20664031 has 2 divisors, whose sum is σ = 20664032. Its totient is φ = 20664030.

The previous prime is 20664023. The next prime is 20664113. The reversal of 20664031 is 13046602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20664031 - 2³ = 20664023 is a prime.

It is a super-2 number, since 2×20664031² = 854004354337922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20663993 and 20664011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20664131) 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 as a sum of consecutive naturals, namely, 10332015 + 10332016.

It is an arithmetic number, because the mean of its divisors is an integer number (10332016).

Almost surely, 2^20664031 is an apocalyptic number.

20664031 is a deficient number, since it is larger than the sum of its proper divisors (1).

20664031 is an equidigital number, since it uses as much as digits as its factorization.

20664031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 20664031 is about 4545.7706717343. The cubic root of 20664031 is about 274.4132105189.

The spelling of 20664031 in words is "twenty million, six hundred sixty-four thousand, thirty-one".