20785230 has 48 divisors (see below), whose sum is σ = 54422784. Its totient is φ = 5503680.

The previous prime is 20785213. The next prime is 20785241. The reversal of 20785230 is 3258702.

It is a junction number, because it is equal to n+sod(n) for n = 20785194 and 20785203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13395 + ... + 14865.

It is an arithmetic number, because the mean of its divisors is an integer number (1133808).

Almost surely, 2^20785230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20785230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27211392).

20785230 is an abundant number, since it is smaller than the sum of its proper divisors (33637554).

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

20785230 is a wasteful number, since it uses less digits than its factorization.

20785230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1641 (or 1638 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20785230 is about 4559.0821444672. The cubic root of 20785230 is about 274.9486625932.

The spelling of 20785230 in words is "twenty million, seven hundred eighty-five thousand, two hundred thirty".