820547142 has 16 divisors (see below), whose sum is σ = 1664209152. Its totient is φ = 269663240.

The previous prime is 820547111. The next prime is 820547171. The reversal of 820547142 is 241745028.

It is a super-2 number, since 2×820547142² = 1346595224488736328, which contains 22 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 962658 + ... + 963509.

It is an arithmetic number, because the mean of its divisors is an integer number (104013072).

Almost surely, 2^820547142 is an apocalyptic number.

820547142 is an abundant number, since it is smaller than the sum of its proper divisors (843662010).

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

820547142 is a wasteful number, since it uses less digits than its factorization.

820547142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1926243.

The product of its (nonzero) digits is 17920, while the sum is 33.

The square root of 820547142 is about 28645.1940471696. The cubic root of 820547142 is about 936.1982946996.

The spelling of 820547142 in words is "eight hundred twenty million, five hundred forty-seven thousand, one hundred forty-two".