20478284 has 6 divisors (see below), whose sum is σ = 35837004. Its totient is φ = 10239140.

The previous prime is 20478281. The next prime is 20478287. The reversal of 20478284 is 48287402.

It is an interprime number because it is at equal distance from previous prime (20478281) and next prime (20478287).

It is not an unprimeable number, because it can be changed into a prime (20478281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2559782 + ... + 2559789.

It is an arithmetic number, because the mean of its divisors is an integer number (5972834).

Almost surely, 2^20478284 is an apocalyptic number.

It is an amenable number.

20478284 is a deficient number, since it is larger than the sum of its proper divisors (15358720).

20478284 is a wasteful number, since it uses less digits than its factorization.

20478284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5119575 (or 5119573 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 35.

The square root of 20478284 is about 4525.2938026166. The cubic root of 20478284 is about 273.5885097998.

The spelling of 20478284 in words is "twenty million, four hundred seventy-eight thousand, two hundred eighty-four".