20284830 has 80 divisors (see below), whose sum is σ = 55408320. Its totient is φ = 5323968.

The previous prime is 20284813. The next prime is 20284841. The reversal of 20284830 is 3848202.

It is a super-2 number, since 2×20284830² = 822948656257800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20284794 and 20284803.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 63832 + ... + 64148.

It is an arithmetic number, because the mean of its divisors is an integer number (692604).

Almost surely, 2^20284830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20284830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27704160).

20284830 is an abundant number, since it is smaller than the sum of its proper divisors (35123490).

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

20284830 is a wasteful number, since it uses less digits than its factorization.

20284830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415 (or 406 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 20284830 is about 4503.8683373296. The cubic root of 20284830 is about 272.7242717852.

The spelling of 20284830 in words is "twenty million, two hundred eighty-four thousand, eight hundred thirty".