100781020 has 12 divisors (see below), whose sum is σ = 211640184. Its totient is φ = 40312400.

The previous prime is 100780973. The next prime is 100781033. The reversal of 100781020 is 20187001.

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 3 ways as a sum of consecutive naturals, for example, 2519506 + ... + 2519545.

It is an arithmetic number, because the mean of its divisors is an integer number (17636682).

Almost surely, 2^100781020 is an apocalyptic number.

100781020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100781020 is an abundant number, since it is smaller than the sum of its proper divisors (110859164).

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

100781020 is a wasteful number, since it uses less digits than its factorization.

100781020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5039060 (or 5039058 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 100781020 is about 10038.9750472845. The cubic root of 100781020 is about 465.3641422520.

The spelling of 100781020 in words is "one hundred million, seven hundred eighty-one thousand, twenty".