820223490 has 32 divisors (see below), whose sum is σ = 1971253440. Its totient is φ = 218424384.

The previous prime is 820223477. The next prime is 820223519. The reversal of 820223490 is 94322028.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3672 + ... + 40668.

It is an arithmetic number, because the mean of its divisors is an integer number (61601670).

Almost surely, 2^820223490 is an apocalyptic number.

820223490 is an abundant number, since it is smaller than the sum of its proper divisors (1151029950).

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

820223490 is a wasteful number, since it uses less digits than its factorization.

820223490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37746.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 820223490 is about 28639.5441653669. The cubic root of 820223490 is about 936.0751889157.

The spelling of 820223490 in words is "eight hundred twenty million, two hundred twenty-three thousand, four hundred ninety".