20395830 has 128 divisors (see below), whose sum is σ = 62447616. Its totient is φ = 4147200.

The previous prime is 20395811. The next prime is 20395841. The reversal of 20395830 is 3859302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 84510 + ... + 84750.

It is an arithmetic number, because the mean of its divisors is an integer number (487872).

Almost surely, 2^20395830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20395830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31223808).

20395830 is an abundant number, since it is smaller than the sum of its proper divisors (42051786).

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

20395830 is a wasteful number, since it uses less digits than its factorization.

20395830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 20395830 is about 4516.1742659025. The cubic root of 20395830 is about 273.2208225553.

The spelling of 20395830 in words is "twenty million, three hundred ninety-five thousand, eight hundred thirty".