820000442 has 32 divisors (see below), whose sum is σ = 1317772800. Its totient is φ = 381553200.

The previous prime is 820000429. The next prime is 820000453. The reversal of 820000442 is 244000028.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1324409 + ... + 1325027.

It is an arithmetic number, because the mean of its divisors is an integer number (41180400).

Almost surely, 2^820000442 is an apocalyptic number.

820000442 is a deficient number, since it is larger than the sum of its proper divisors (497772358).

820000442 is a wasteful number, since it uses less digits than its factorization.

820000442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 820000442 is about 28635.6498442064. The cubic root of 820000442 is about 935.9903304879.

The spelling of 820000442 in words is "eight hundred twenty million, four hundred forty-two", and thus it is an aban number.