20468831 has 2 divisors, whose sum is σ = 20468832. Its totient is φ = 20468830.

The previous prime is 20468801. The next prime is 20468837. The reversal of 20468831 is 13886402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20468831 - 2¹⁸ = 20206687 is a prime.

It is a super-2 number, since 2×20468831² = 837946085013122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20468837) 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 as a sum of consecutive naturals, namely, 10234415 + 10234416.

It is an arithmetic number, because the mean of its divisors is an integer number (10234416).

Almost surely, 2^20468831 is an apocalyptic number.

20468831 is a deficient number, since it is larger than the sum of its proper divisors (1).

20468831 is an equidigital number, since it uses as much as digits as its factorization.

20468831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 20468831 is about 4524.2492194838. The cubic root of 20468831 is about 273.5464061706.

The spelling of 20468831 in words is "twenty million, four hundred sixty-eight thousand, eight hundred thirty-one".