820806141 has 4 divisors (see below), whose sum is σ = 1094408192. Its totient is φ = 547204092.

The previous prime is 820806139. The next prime is 820806163. The reversal of 820806141 is 141608028.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 820806141 - 2¹ = 820806139 is a prime.

It is a super-2 number, since 2×820806141² = 1347445442206623762, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 820806099 and 820806108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820806131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136801021 + ... + 136801026.

It is an arithmetic number, because the mean of its divisors is an integer number (273602048).

Almost surely, 2^820806141 is an apocalyptic number.

It is an amenable number.

820806141 is a deficient number, since it is larger than the sum of its proper divisors (273602051).

820806141 is a wasteful number, since it uses less digits than its factorization.

820806141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273602050.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 820806141 is about 28649.7145011953. The cubic root of 820806141 is about 936.2967854515.

The spelling of 820806141 in words is "eight hundred twenty million, eight hundred six thousand, one hundred forty-one".