20649378593636 has 12 divisors (see below), whose sum is σ = 38916136580412. Its totient is φ = 9530482427808.

The previous prime is 20649378593611. The next prime is 20649378593659. The reversal of 20649378593636 is 63639587394602.

It can be written as a sum of positive squares in 2 ways, for example, as 810460865536 + 19838917728100 = 900256^2 + 4454090^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20649378593636.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198551717195 + ... + 198551717298.

It is an arithmetic number, because the mean of its divisors is an integer number (3243011381701).

Almost surely, 2^{20649378593636} is an apocalyptic number.

20649378593636 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20649378593636 is a deficient number, since it is larger than the sum of its proper divisors (18266757986776).

20649378593636 is a wasteful number, since it uses less digits than its factorization.

20649378593636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397103434510 (or 397103434508 counting only the distinct ones).

The product of its (nonzero) digits is 1058158080, while the sum is 71.

The spelling of 20649378593636 in words is "twenty trillion, six hundred forty-nine billion, three hundred seventy-eight million, five hundred ninety-three thousand, six hundred thirty-six".