20659890889510 has 32 divisors (see below), whose sum is σ = 38739588307200. Its totient is φ = 7924006673280.

The previous prime is 20659890889501. The next prime is 20659890889523. The reversal of 20659890889510 is 1598809895602.

It is a self number, because there is not a number n which added to its sum of digits gives 20659890889510.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 305676345 + ... + 305743924.

It is an arithmetic number, because the mean of its divisors is an integer number (1210612134600).

Almost surely, 2^{20659890889510} is an apocalyptic number.

20659890889510 is a deficient number, since it is larger than the sum of its proper divisors (18079697417690).

20659890889510 is a wasteful number, since it uses less digits than its factorization.

20659890889510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611420416.

The product of its (nonzero) digits is 111974400, while the sum is 70.

The spelling of 20659890889510 in words is "twenty trillion, six hundred fifty-nine billion, eight hundred ninety million, eight hundred eighty-nine thousand, five hundred ten".