20284580 has 12 divisors (see below), whose sum is σ = 42597660. Its totient is φ = 8113824.

The previous prime is 20284559. The next prime is 20284603. The reversal of 20284580 is 8548202.

It can be written as a sum of positive squares in 2 ways, for example, as 13853284 + 6431296 = 3722^2 + 2536^2 .

It is a super-2 number, since 2×20284580² = 822928371552800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507095 + ... + 507134.

It is an arithmetic number, because the mean of its divisors is an integer number (3549805).

Almost surely, 2^20284580 is an apocalyptic number.

20284580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20284580 is an abundant number, since it is smaller than the sum of its proper divisors (22313080).

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

20284580 is a wasteful number, since it uses less digits than its factorization.

20284580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014238 (or 1014236 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 29.

The square root of 20284580 is about 4503.8405833244. The cubic root of 20284580 is about 272.7231513855.

The spelling of 20284580 in words is "twenty million, two hundred eighty-four thousand, five hundred eighty".