20464603997 has 2 divisors, whose sum is σ = 20464603998. Its totient is φ = 20464603996.

The previous prime is 20464603979. The next prime is 20464604009. The reversal of 20464603997 is 79930646402.

Together with previous prime (20464603979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20144408761 + 320195236 = 141931^2 + 17894^2 .

It is a cyclic number.

It is not a de Polignac number, because 20464603997 - 2⁸ = 20464603741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20464603937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10232301998 + 10232301999.

It is an arithmetic number, because the mean of its divisors is an integer number (10232301999).

Almost surely, 2^20464603997 is an apocalyptic number.

It is an amenable number.

20464603997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20464603997 is an equidigital number, since it uses as much as digits as its factorization.

20464603997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 50.

The spelling of 20464603997 in words is "twenty billion, four hundred sixty-four million, six hundred three thousand, nine hundred ninety-seven".