820146990 has 32 divisors (see below), whose sum is σ = 2119765536. Its totient is φ = 201882240.

The previous prime is 820146979. The next prime is 820147007. The reversal of 820146990 is 99641028.

820146990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

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, 1051081 + ... + 1051860.

It is an arithmetic number, because the mean of its divisors is an integer number (66242673).

Almost surely, 2^820146990 is an apocalyptic number.

820146990 is an abundant number, since it is smaller than the sum of its proper divisors (1299618546).

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

820146990 is a wasteful number, since it uses less digits than its factorization.

820146990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102964.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 820146990 is about 28638.2085682747. The cubic root of 820146990 is about 936.0460862873.

The spelling of 820146990 in words is "eight hundred twenty million, one hundred forty-six thousand, nine hundred ninety".