20551160 has 64 divisors (see below), whose sum is σ = 55641600. Its totient is φ = 6673536.

The previous prime is 20551159. The next prime is 20551183. The reversal of 20551160 is 6115502.

20551160 = 60² + 61² + ... + 395².

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3389 + ... + 7251.

It is an arithmetic number, because the mean of its divisors is an integer number (869400).

Almost surely, 2^20551160 is an apocalyptic number.

20551160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20551160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27820800).

20551160 is an abundant number, since it is smaller than the sum of its proper divisors (35090440).

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

20551160 is a wasteful number, since it uses less digits than its factorization.

20551160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3900 (or 3896 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 20551160 is about 4533.3387254870. The cubic root of 20551160 is about 273.9126650814.

Adding to 20551160 its reverse (6115502), we get a palindrome (26666662).

The spelling of 20551160 in words is "twenty million, five hundred fifty-one thousand, one hundred sixty".