20661160 has 32 divisors (see below), whose sum is σ = 50064840. Its totient is φ = 7628544.

The previous prime is 20661143. The next prime is 20661191. The reversal of 20661160 is 6116602.

It can be written as a sum of positive squares in 4 ways, for example, as 17791524 + 2869636 = 4218^2 + 1694^2 .

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, 19347 + ... + 20386.

Almost surely, 2^20661160 is an apocalyptic number.

20661160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20661160 is an abundant number, since it is smaller than the sum of its proper divisors (29403680).

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

20661160 is a wasteful number, since it uses less digits than its factorization.

20661160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39757 (or 39753 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20661160 is about 4545.4548727273. The cubic root of 20661160 is about 274.4005012075.

Adding to 20661160 its reverse (6116602), we get a palindrome (26777762).

The spelling of 20661160 in words is "twenty million, six hundred sixty-one thousand, one hundred sixty".