20550660 has 48 divisors (see below), whose sum is σ = 61970496. Its totient is φ = 5058432.

The previous prime is 20550659. The next prime is 20550667. The reversal of 20550660 is 6605502.

It is a self number, because there is not a number n which added to its sum of digits gives 20550660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20550667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12394 + ... + 13953.

It is an arithmetic number, because the mean of its divisors is an integer number (1291052).

Almost surely, 2^20550660 is an apocalyptic number.

20550660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20550660 is an abundant number, since it is smaller than the sum of its proper divisors (41419836).

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

20550660 is a wasteful number, since it uses less digits than its factorization.

20550660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26372 (or 26370 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 20550660 is about 4533.2835781583. The cubic root of 20550660 is about 273.9104436749.

The spelling of 20550660 in words is "twenty million, five hundred fifty thousand, six hundred sixty".