20285104 has 40 divisors (see below), whose sum is σ = 45274880. Its totient is φ = 8624448.

The previous prime is 20285099. The next prime is 20285263. The reversal of 20285104 is 40158202.

It is a super-2 number, since 2×20285104² = 822970888581632, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14917 + ... + 16219.

It is an arithmetic number, because the mean of its divisors is an integer number (1131872).

Almost surely, 2^20285104 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 20285104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22637440).

20285104 is an abundant number, since it is smaller than the sum of its proper divisors (24989776).

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

20285104 is a wasteful number, since it uses less digits than its factorization.

20285104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1457 (or 1451 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 20285104 is about 4503.8987555228. The cubic root of 20285104 is about 272.7254997326.

The spelling of 20285104 in words is "twenty million, two hundred eighty-five thousand, one hundred four".