1820086554 has 128 divisors (see below), whose sum is σ = 4499712000. Its totient is φ = 482929920.

The previous prime is 1820086523. The next prime is 1820086571. The reversal of 1820086554 is 4556800281.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2940057 + ... + 2940675.

It is an arithmetic number, because the mean of its divisors is an integer number (35154000).

Almost surely, 2^1820086554 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1820086554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2249856000).

1820086554 is an abundant number, since it is smaller than the sum of its proper divisors (2679625446).

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

1820086554 is a wasteful number, since it uses less digits than its factorization.

1820086554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820.

The product of its (nonzero) digits is 76800, while the sum is 39.

The square root of 1820086554 is about 42662.4724318692. The cubic root of 1820086554 is about 1220.9485040740.

The spelling of 1820086554 in words is "one billion, eight hundred twenty million, eighty-six thousand, five hundred fifty-four".