20493331 has 2 divisors, whose sum is σ = 20493332. Its totient is φ = 20493330.

The previous prime is 20493323. The next prime is 20493337. The reversal of 20493331 is 13339402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20493331 - 2³ = 20493323 is a prime.

It is a super-2 number, since 2×20493331² = 839953230951122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20493296 and 20493305.

It is not a weakly prime, because it can be changed into another prime (20493337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10246665 + 10246666.

It is an arithmetic number, because the mean of its divisors is an integer number (10246666).

Almost surely, 2^20493331 is an apocalyptic number.

20493331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20493331 is an equidigital number, since it uses as much as digits as its factorization.

20493331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 20493331 is about 4526.9560413152. The cubic root of 20493331 is about 273.6555023668.

The spelling of 20493331 in words is "twenty million, four hundred ninety-three thousand, three hundred thirty-one".