20578092449987 has 2 divisors, whose sum is σ = 20578092449988. Its totient is φ = 20578092449986.

The previous prime is 20578092449953. The next prime is 20578092450029. The reversal of 20578092449987 is 78994429087502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20578092449987 - 2³² = 20573797482691 is a prime.

It is not a weakly prime, because it can be changed into another prime (20578092449947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10289046224993 + 10289046224994.

It is an arithmetic number, because the mean of its divisors is an integer number (10289046224994).

Almost surely, 2^{20578092449987} is an apocalyptic number.

20578092449987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20578092449987 is an equidigital number, since it uses as much as digits as its factorization.

20578092449987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 731566080, while the sum is 74.

The spelling of 20578092449987 in words is "twenty trillion, five hundred seventy-eight billion, ninety-two million, four hundred forty-nine thousand, nine hundred eighty-seven".