20478380 has 48 divisors (see below), whose sum is σ = 46945920. Its totient is φ = 7458048.

The previous prime is 20478373. The next prime is 20478397. The reversal of 20478380 is 8387402.

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 15 ways as a sum of consecutive naturals, for example, 20042 + ... + 21038.

It is an arithmetic number, because the mean of its divisors is an integer number (978040).

Almost surely, 2^20478380 is an apocalyptic number.

20478380 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 20478380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23472960).

20478380 is an abundant number, since it is smaller than the sum of its proper divisors (26467540).

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

20478380 is a wasteful number, since it uses less digits than its factorization.

20478380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098 (or 1096 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 20478380 is about 4525.3044096503. The cubic root of 20478380 is about 273.5889373170.

The spelling of 20478380 in words is "twenty million, four hundred seventy-eight thousand, three hundred eighty".