20415502320457 has 2 divisors, whose sum is σ = 20415502320458. Its totient is φ = 20415502320456.

The previous prime is 20415502320443. The next prime is 20415502320469. The reversal of 20415502320457 is 75402320551402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16397445989376 + 4018056331081 = 4049376^2 + 2004509^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20415502320457 is a prime.

It is not a weakly prime, because it can be changed into another prime (20415502320427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10207751160228 + 10207751160229.

It is an arithmetic number, because the mean of its divisors is an integer number (10207751160229).

Almost surely, 2^{20415502320457} is an apocalyptic number.

It is an amenable number.

20415502320457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20415502320457 is an equidigital number, since it uses as much as digits as its factorization.

20415502320457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336000, while the sum is 40.

Adding to 20415502320457 its reverse (75402320551402), we get a palindrome (95817822871859).

The spelling of 20415502320457 in words is "twenty trillion, four hundred fifteen billion, five hundred two million, three hundred twenty thousand, four hundred fifty-seven".