20555766 has 48 divisors (see below), whose sum is σ = 55531008. Its totient is φ = 5338800.

The previous prime is 20555753. The next prime is 20555789. The reversal of 20555766 is 66755502.

It is a self number, because there is not a number n which added to its sum of digits gives 20555766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6030 + ... + 8801.

It is an arithmetic number, because the mean of its divisors is an integer number (1156896).

Almost surely, 2^20555766 is an apocalyptic number.

20555766 is an abundant number, since it is smaller than the sum of its proper divisors (34975242).

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

20555766 is a wasteful number, since it uses less digits than its factorization.

20555766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14857 (or 14854 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 36.

The square root of 20555766 is about 4533.8467111273. The cubic root of 20555766 is about 273.9331269838.

It can be divided in two parts, 20555 and 766, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 20555766 in words is "twenty million, five hundred fifty-five thousand, seven hundred sixty-six".