20478532284 has 144 divisors (see below), whose sum is σ = 60269017536. Its totient is φ = 5741798400.

The previous prime is 20478532279. The next prime is 20478532301. The reversal of 20478532284 is 48223587402.

20478532284 is a `hidden beast` number, since 20 + 4 + 78 + 532 + 28 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8007534 + ... + 8010090.

It is an arithmetic number, because the mean of its divisors is an integer number (418534844).

Almost surely, 2^20478532284 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20478532284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30134508768).

20478532284 is an abundant number, since it is smaller than the sum of its proper divisors (39790485252).

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

20478532284 is a wasteful number, since it uses less digits than its factorization.

20478532284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3156 (or 3151 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 45.

The spelling of 20478532284 in words is "twenty billion, four hundred seventy-eight million, five hundred thirty-two thousand, two hundred eighty-four".