20520180 has 36 divisors (see below), whose sum is σ = 62245092. Its totient is φ = 5472000.

The previous prime is 20520179. The next prime is 20520191. The reversal of 20520180 is 8102502.

It can be written as a sum of positive squares in 2 ways, for example, as 11009124 + 9511056 = 3318^2 + 3084^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56821 + ... + 57180.

Almost surely, 2^20520180 is an apocalyptic number.

20520180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20520180 is an abundant number, since it is smaller than the sum of its proper divisors (41724912).

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

20520180 is a wasteful number, since it uses less digits than its factorization.

20520180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114016 (or 114011 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 20520180 is about 4529.9205291042. The cubic root of 20520180 is about 273.7749586301.

Adding to 20520180 its reverse (8102502), we get a palindrome (28622682).

The spelling of 20520180 in words is "twenty million, five hundred twenty thousand, one hundred eighty".