20745180 has 96 divisors (see below), whose sum is σ = 66185280. Its totient is φ = 5391360.

The previous prime is 20745161. The next prime is 20745181. The reversal of 20745180 is 8154702.

20745180 is a `hidden beast` number, since 207 + 451 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20745181) 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, 21672 + ... + 22608.

It is an arithmetic number, because the mean of its divisors is an integer number (689430).

Almost surely, 2^20745180 is an apocalyptic number.

20745180 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 20745180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33092640).

20745180 is an abundant number, since it is smaller than the sum of its proper divisors (45440100).

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

20745180 is a wasteful number, since it uses less digits than its factorization.

20745180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996 (or 988 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 20745180 is about 4554.6876951115. The cubic root of 20745180 is about 274.7719541943.

Adding to 20745180 its reverse (8154702), we get a palindrome (28899882).

The spelling of 20745180 in words is "twenty million, seven hundred forty-five thousand, one hundred eighty".