20345020052509 has 2 divisors, whose sum is σ = 20345020052510. Its totient is φ = 20345020052508.

The previous prime is 20345020052471. The next prime is 20345020052573. The reversal of 20345020052509 is 90525002054302.

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., 18755915256100 + 1589104796409 = 4330810^2 + 1260597^2 .

It is a cyclic number.

It is not a de Polignac number, because 20345020052509 - 2⁹ = 20345020051997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20345020058509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10172510026254 + 10172510026255.

It is an arithmetic number, because the mean of its divisors is an integer number (10172510026255).

Almost surely, 2^{20345020052509} is an apocalyptic number.

It is an amenable number.

20345020052509 is a deficient number, since it is larger than the sum of its proper divisors (1).

20345020052509 is an equidigital number, since it uses as much as digits as its factorization.

20345020052509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108000, while the sum is 37.

The spelling of 20345020052509 in words is "twenty trillion, three hundred forty-five billion, twenty million, fifty-two thousand, five hundred nine".