1861016020 has 24 divisors (see below), whose sum is σ = 4078053504. Its totient is φ = 712040736.

The previous prime is 1861015967. The next prime is 1861016023. The reversal of 1861016020 is 206101681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861016023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2022384 + ... + 2023303.

It is an arithmetic number, because the mean of its divisors is an integer number (169918896).

Almost surely, 2^1861016020 is an apocalyptic number.

1861016020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1861016020 is an abundant number, since it is smaller than the sum of its proper divisors (2217037484).

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

1861016020 is a wasteful number, since it uses less digits than its factorization.

1861016020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4045719 (or 4045717 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1861016020 is about 43139.4948973675. The cubic root of 1861016020 is about 1230.0328323137.

The spelling of 1861016020 in words is "one billion, eight hundred sixty-one million, sixteen thousand, twenty".