20515463 has 2 divisors, whose sum is σ = 20515464. Its totient is φ = 20515462.

The previous prime is 20515393. The next prime is 20515477. The reversal of 20515463 is 36451502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20515463 - 2⁸ = 20515207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20515483) 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, 10257731 + 10257732.

It is an arithmetic number, because the mean of its divisors is an integer number (10257732).

Almost surely, 2^20515463 is an apocalyptic number.

20515463 is a deficient number, since it is larger than the sum of its proper divisors (1).

20515463 is an equidigital number, since it uses as much as digits as its factorization.

20515463 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20515463 is about 4529.3998498697. The cubic root of 20515463 is about 273.7539793560.

Adding to 20515463 its reverse (36451502), we get a palindrome (56966965).

The spelling of 20515463 in words is "twenty million, five hundred fifteen thousand, four hundred sixty-three".