20884981766 has 16 divisors (see below), whose sum is σ = 34200221328. Its totient is φ = 9486285600.

The previous prime is 20884981679. The next prime is 20884981771. The reversal of 20884981766 is 66718948802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313325 + ... + 374088.

It is an arithmetic number, because the mean of its divisors is an integer number (2137513833).

Almost surely, 2^20884981766 is an apocalyptic number.

20884981766 is a deficient number, since it is larger than the sum of its proper divisors (13315239562).

20884981766 is a wasteful number, since it uses less digits than its factorization.

20884981766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688807.

The product of its (nonzero) digits is 9289728, while the sum is 59.

The spelling of 20884981766 in words is "twenty billion, eight hundred eighty-four million, nine hundred eighty-one thousand, seven hundred sixty-six".