20817230 has 32 divisors (see below), whose sum is σ = 43352064. Its totient is φ = 7049376.

The previous prime is 20817229. The next prime is 20817233. The reversal of 20817230 is 3271802.

It is a junction number, because it is equal to n+sod(n) for n = 20817196 and 20817205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20817233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4019 + ... + 7601.

It is an arithmetic number, because the mean of its divisors is an integer number (1354752).

Almost surely, 2^20817230 is an apocalyptic number.

20817230 is an abundant number, since it is smaller than the sum of its proper divisors (22534834).

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

20817230 is a wasteful number, since it uses less digits than its factorization.

20817230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3680.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 20817230 is about 4562.5902730795. The cubic root of 20817230 is about 275.0896897533.

The spelling of 20817230 in words is "twenty million, eight hundred seventeen thousand, two hundred thirty".