100820445 has 16 divisors (see below), whose sum is σ = 175977792. Its totient is φ = 48882560.

The previous prime is 100820411. The next prime is 100820491. The reversal of 100820445 is 544028001.

It is not a de Polignac number, because 100820445 - 2⁶ = 100820381 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 15 ways as a sum of consecutive naturals, for example, 305352 + ... + 305681.

It is an arithmetic number, because the mean of its divisors is an integer number (10998612).

Almost surely, 2^100820445 is an apocalyptic number.

100820445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

100820445 is a deficient number, since it is larger than the sum of its proper divisors (75157347).

100820445 is a wasteful number, since it uses less digits than its factorization.

100820445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611052.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 100820445 is about 10040.9384521568. The cubic root of 100820445 is about 465.4248170014.

Adding to 100820445 its reverse (544028001), we get a palindrome (644848446).

The spelling of 100820445 in words is "one hundred million, eight hundred twenty thousand, four hundred forty-five".