20780284 has 12 divisors (see below), whose sum is σ = 41560624. Its totient is φ = 8905824.

The previous prime is 20780257. The next prime is 20780303. The reversal of 20780284 is 48208702.

20780284 is an admirable number.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

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, 371049 + ... + 371104.

Almost surely, 2^20780284 is an apocalyptic number.

It is an amenable number.

20780284 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20780284 is a wasteful number, since it uses less digits than its factorization.

20780284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742164 (or 742162 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 20780284 is about 4558.5396784497. The cubic root of 20780284 is about 274.9268521703.

Adding to 20780284 its reverse (48208702), we get a palindrome (68988986).

The spelling of 20780284 in words is "twenty million, seven hundred eighty thousand, two hundred eighty-four".