20302830 has 96 divisors (see below), whose sum is σ = 57507840. Its totient is φ = 4950720.

The previous prime is 20302829. The next prime is 20302847. The reversal of 20302830 is 3820302.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 52819 + ... + 53201.

It is an arithmetic number, because the mean of its divisors is an integer number (599040).

Almost surely, 2^20302830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20302830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28753920).

20302830 is an abundant number, since it is smaller than the sum of its proper divisors (37205010).

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

20302830 is a wasteful number, since it uses less digits than its factorization.

20302830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446 (or 443 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 20302830 is about 4505.8661764416. The cubic root of 20302830 is about 272.8049163781.

The spelling of 20302830 in words is "twenty million, three hundred two thousand, eight hundred thirty".