20329884 has 72 divisors (see below), whose sum is σ = 54966912. Its totient is φ = 6320160.

The previous prime is 20329879. The next prime is 20329889. The reversal of 20329884 is 48892302.

It is an interprime number because it is at equal distance from previous prime (20329879) and next prime (20329889).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20329889) 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 23 ways as a sum of consecutive naturals, for example, 35319 + ... + 35889.

Almost surely, 2^20329884 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 20329884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27483456).

20329884 is an abundant number, since it is smaller than the sum of its proper divisors (34637028).

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

20329884 is a wasteful number, since it uses less digits than its factorization.

20329884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647 (or 642 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 20329884 is about 4508.8672635153. The cubic root of 20329884 is about 272.9260355918.

The spelling of 20329884 in words is "twenty million, three hundred twenty-nine thousand, eight hundred eighty-four".