20705656211664 has 40 divisors (see below), whose sum is σ = 53503516597440. Its totient is φ = 6900091246848.

The previous prime is 20705656211663. The next prime is 20705656211677. The reversal of 20705656211664 is 46611265650702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20705656211663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55880829 + ... + 56250140.

It is an arithmetic number, because the mean of its divisors is an integer number (1337587914936).

Almost surely, 2^{20705656211664} is an apocalyptic number.

20705656211664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20705656211664 is an abundant number, since it is smaller than the sum of its proper divisors (32797860385776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20705656211664 is a wasteful number, since it uses less digits than its factorization.

20705656211664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112134827 (or 112134821 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 51.

The spelling of 20705656211664 in words is "twenty trillion, seven hundred five billion, six hundred fifty-six million, two hundred eleven thousand, six hundred sixty-four".