820231730 has 16 divisors (see below), whose sum is σ = 1494206784. Its totient is φ = 324139440.

The previous prime is 820231693. The next prime is 820231757. The reversal of 820231730 is 37132028.

It is a self number, because there is not a number n which added to its sum of digits gives 820231730.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 493286 + ... + 494945.

It is an arithmetic number, because the mean of its divisors is an integer number (93387924).

Almost surely, 2^820231730 is an apocalyptic number.

820231730 is a deficient number, since it is larger than the sum of its proper divisors (673975054).

820231730 is a wasteful number, since it uses less digits than its factorization.

820231730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988321.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 820231730 is about 28639.6880220438. The cubic root of 820231730 is about 936.0783235222.

Adding to 820231730 its reverse (37132028), we get a palindrome (857363758).

The spelling of 820231730 in words is "eight hundred twenty million, two hundred thirty-one thousand, seven hundred thirty".