20329380 has 144 divisors (see below), whose sum is σ = 66044160. Its totient is φ = 5246208.

The previous prime is 20329363. The next prime is 20329417. The reversal of 20329380 is 8392302.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 228376 + ... + 228464.

It is an arithmetic number, because the mean of its divisors is an integer number (458640).

Almost surely, 2^20329380 is an apocalyptic number.

20329380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20329380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33022080).

20329380 is an abundant number, since it is smaller than the sum of its proper divisors (45714780).

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

20329380 is a wasteful number, since it uses less digits than its factorization.

20329380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 20329380 is about 4508.8113733001. The cubic root of 20329380 is about 272.9237801952.

The spelling of 20329380 in words is "twenty million, three hundred twenty-nine thousand, three hundred eighty".