20669180 has 96 divisors (see below), whose sum is σ = 53222400. Its totient is φ = 6726720.

The previous prime is 20669177. The next prime is 20669183. The reversal of 20669180 is 8196602.

It is an interprime number because it is at equal distance from previous prime (20669177) and next prime (20669183).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20669183) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 157715 + ... + 157845.

It is an arithmetic number, because the mean of its divisors is an integer number (554400).

Almost surely, 2^20669180 is an apocalyptic number.

20669180 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 20669180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26611200).

20669180 is an abundant number, since it is smaller than the sum of its proper divisors (32553220).

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

20669180 is a wasteful number, since it uses less digits than its factorization.

20669180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 20669180 is about 4546.3369870699. The cubic root of 20669180 is about 274.4360011074.

The spelling of 20669180 in words is "twenty million, six hundred sixty-nine thousand, one hundred eighty".