20348820 has 144 divisors (see below), whose sum is σ = 66044160. Its totient is φ = 5256576.

The previous prime is 20348819. The next prime is 20348837. The reversal of 20348820 is 2884302.

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

It is a congruent number.

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, 257541 + ... + 257619.

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

Almost surely, 2^20348820 is an apocalyptic number.

20348820 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 20348820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33022080).

20348820 is an abundant number, since it is smaller than the sum of its proper divisors (45695340).

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

20348820 is a wasteful number, since it uses less digits than its factorization.

20348820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 20348820 is about 4510.9666369859. The cubic root of 20348820 is about 273.0107470712.

The spelling of 20348820 in words is "twenty million, three hundred forty-eight thousand, eight hundred twenty".