20505467 has 2 divisors, whose sum is σ = 20505468. Its totient is φ = 20505466.

The previous prime is 20505449. The next prime is 20505469. The reversal of 20505467 is 76450502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20505467 - 2¹⁶ = 20439931 is a prime.

Together with 20505469, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20505469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10252733 + 10252734.

It is an arithmetic number, because the mean of its divisors is an integer number (10252734).

Almost surely, 2^20505467 is an apocalyptic number.

20505467 is a deficient number, since it is larger than the sum of its proper divisors (1).

20505467 is an equidigital number, since it uses as much as digits as its factorization.

20505467 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 20505467 is about 4528.2962579761. The cubic root of 20505467 is about 273.7095106328.

Adding to 20505467 its reverse (76450502), we get a palindrome (96955969).

The spelling of 20505467 in words is "twenty million, five hundred five thousand, four hundred sixty-seven".