20129284 has 48 divisors (see below), whose sum is σ = 42824320. Its totient is φ = 8087040.

The previous prime is 20129269. The next prime is 20129287. The reversal of 20129284 is 48292102.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20129287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83404 + ... + 83644.

Almost surely, 2^20129284 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20129284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21412160).

20129284 is an abundant number, since it is smaller than the sum of its proper divisors (22695036).

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

20129284 is a wasteful number, since it uses less digits than its factorization.

20129284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20129284 is about 4486.5670617968. The cubic root of 20129284 is about 272.0253905075.

The spelling of 20129284 in words is "twenty million, one hundred twenty-nine thousand, two hundred eighty-four".