20245405997 has 2 divisors, whose sum is σ = 20245405998. Its totient is φ = 20245405996.

The previous prime is 20245405981. The next prime is 20245406039. The reversal of 20245405997 is 79950454202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19263774436 + 981631561 = 138794^2 + 31331^2 .

It is a cyclic number.

It is not a de Polignac number, because 20245405997 - 2⁴ = 20245405981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20245407997) 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, 10122702998 + 10122702999.

It is an arithmetic number, because the mean of its divisors is an integer number (10122702999).

Almost surely, 2^20245405997 is an apocalyptic number.

It is an amenable number.

20245405997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20245405997 is an equidigital number, since it uses as much as digits as its factorization.

20245405997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 907200, while the sum is 47.

The spelling of 20245405997 in words is "twenty billion, two hundred forty-five million, four hundred five thousand, nine hundred ninety-seven".