820450093 has 4 divisors (see below), whose sum is σ = 820754560. Its totient is φ = 820145628.

The previous prime is 820450091. The next prime is 820450109. The reversal of 820450093 is 390054028.

820450093 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 820450093 - 2¹ = 820450091 is a prime.

It is the 28644-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820450091) by changing a digit.

It is a nontrivial repunit in base 28643.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148155 + ... + 153592.

It is an arithmetic number, because the mean of its divisors is an integer number (205188640).

Almost surely, 2^820450093 is an apocalyptic number.

It is an amenable number.

820450093 is a deficient number, since it is larger than the sum of its proper divisors (304467).

820450093 is a wasteful number, since it uses less digits than its factorization.

820450093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304466.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 820450093 is about 28643.5000130920. The cubic root of 820450093 is about 936.1613840880.

The spelling of 820450093 in words is "eight hundred twenty million, four hundred fifty thousand, ninety-three".