20381583821577 has 64 divisors (see below), whose sum is σ = 30348531118080. Its totient is φ = 12063652761600.

The previous prime is 20381583821549. The next prime is 20381583821597. The reversal of 20381583821577 is 77512838518302.

It is a happy number.

It is not a de Polignac number, because 20381583821577 - 2⁸ = 20381583821321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20381583821577.

It is not an unprimeable number, because it can be changed into a prime (20381583821507) 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 in 63 ways as a sum of consecutive naturals, for example, 143228052 + ... + 143370282.

It is an arithmetic number, because the mean of its divisors is an integer number (474195798720).

Almost surely, 2^{20381583821577} is an apocalyptic number.

It is an amenable number.

20381583821577 is a deficient number, since it is larger than the sum of its proper divisors (9966947296503).

20381583821577 is a wasteful number, since it uses less digits than its factorization.

20381583821577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142934.

The product of its (nonzero) digits is 22579200, while the sum is 60.

The spelling of 20381583821577 in words is "twenty trillion, three hundred eighty-one billion, five hundred eighty-three million, eight hundred twenty-one thousand, five hundred seventy-seven".