20284278 has 32 divisors (see below), whose sum is σ = 46542336. Its totient is φ = 5773248.

The previous prime is 20284273. The next prime is 20284279. The reversal of 20284278 is 87248202.

It is a super-2 number, since 2×20284278² = 822903867962568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20284273) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 12375 + ... + 13917.

It is an arithmetic number, because the mean of its divisors is an integer number (1454448).

Almost surely, 2^20284278 is an apocalyptic number.

20284278 is an abundant number, since it is smaller than the sum of its proper divisors (26258058).

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

20284278 is a wasteful number, since it uses less digits than its factorization.

20284278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1868.

The product of its (nonzero) digits is 14336, while the sum is 33.

The square root of 20284278 is about 4503.8070562581. The cubic root of 20284278 is about 272.7217979305.

The spelling of 20284278 in words is "twenty million, two hundred eighty-four thousand, two hundred seventy-eight".