858490020 has 72 divisors (see below), whose sum is σ = 2608272576. Its totient is φ = 228562752.

The previous prime is 858489979. The next prime is 858490033. The reversal of 858490020 is 20094858.

It is a super-2 number, since 2×858490020² = 1474010228879200800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 23 ways as a sum of consecutive naturals, for example, 119449 + ... + 126431.

It is an arithmetic number, because the mean of its divisors is an integer number (36226008).

Almost surely, 2^858490020 is an apocalyptic number.

It is an amenable number.

858490020 is an abundant number, since it is smaller than the sum of its proper divisors (1749782556).

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

858490020 is a wasteful number, since it uses less digits than its factorization.

858490020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7681 (or 7676 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 858490020 is about 29300.0003412969. Note that the first 3 decimals coincide. The cubic root of 858490020 is about 950.4116480096.

The spelling of 858490020 in words is "eight hundred fifty-eight million, four hundred ninety thousand, twenty".