20566160 has 20 divisors (see below), whose sum is σ = 47816508. Its totient is φ = 8226432.

The previous prime is 20566159. The next prime is 20566171. The reversal of 20566160 is 6166502.

It can be written as a sum of positive squares in 2 ways, for example, as 11397376 + 9168784 = 3376^2 + 3028^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128459 + ... + 128618.

Almost surely, 2^20566160 is an apocalyptic number.

20566160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20566160 is an abundant number, since it is smaller than the sum of its proper divisors (27250348).

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

20566160 is a wasteful number, since it uses less digits than its factorization.

20566160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257090 (or 257084 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20566160 is about 4534.9928335114. The cubic root of 20566160 is about 273.9792905299.

The spelling of 20566160 in words is "twenty million, five hundred sixty-six thousand, one hundred sixty".