20285478 has 20 divisors (see below), whose sum is σ = 45454860. Its totient is φ = 6761772.

The previous prime is 20285477. The next prime is 20285497. The reversal of 20285478 is 87458202.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20285477) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 62448 + ... + 62771.

It is an arithmetic number, because the mean of its divisors is an integer number (2272743).

Almost surely, 2^20285478 is an apocalyptic number.

20285478 is an abundant number, since it is smaller than the sum of its proper divisors (25169382).

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

20285478 is a wasteful number, since it uses less digits than its factorization.

20285478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125233 (or 125224 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 20285478 is about 4503.9402749148. The cubic root of 20285478 is about 272.7271758181.

The spelling of 20285478 in words is "twenty million, two hundred eighty-five thousand, four hundred seventy-eight".