20284356 has 24 divisors (see below), whose sum is σ = 47931520. Its totient is φ = 6675552.

The previous prime is 20284339. The next prime is 20284373. The reversal of 20284356 is 65348202.

It is an interprime number because it is at equal distance from previous prime (20284339) and next prime (20284373).

It is a super-2 number, since 2×20284356² = 822910196669472, 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, 9751 + ... + 11646.

Almost surely, 2^20284356 is an apocalyptic number.

It is an amenable number.

20284356 is an abundant number, since it is smaller than the sum of its proper divisors (27647164).

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

20284356 is a wasteful number, since it uses less digits than its factorization.

20284356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21483 (or 21481 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 20284356 is about 4503.8157155905. The cubic root of 20284356 is about 272.7221474996.

The spelling of 20284356 in words is "twenty million, two hundred eighty-four thousand, three hundred fifty-six".