20642284 has 48 divisors (see below), whose sum is σ = 43394400. Its totient is φ = 8487936.

The previous prime is 20642273. The next prime is 20642291. The reversal of 20642284 is 48224602.

It is a super-2 number, since 2×20642284² = 852207777473312, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16182 + ... + 17410.

It is an arithmetic number, because the mean of its divisors is an integer number (904050).

Almost surely, 2^20642284 is an apocalyptic number.

It is an amenable number.

20642284 is an abundant number, since it is smaller than the sum of its proper divisors (22752116).

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

20642284 is a wasteful number, since it uses less digits than its factorization.

20642284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282 (or 1280 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 20642284 is about 4543.3780384203. The cubic root of 20642284 is about 274.3169118057.

Adding to 20642284 its reverse (48224602), we get a palindrome (68866886).

The spelling of 20642284 in words is "twenty million, six hundred forty-two thousand, two hundred eighty-four".