1801558220 has 96 divisors (see below), whose sum is σ = 4751792640. Its totient is φ = 557360640.

The previous prime is 1801558217. The next prime is 1801558261. The reversal of 1801558220 is 228551081.

It is a happy number.

It is a super-2 number, since 2×1801558220² = 6491224040099136800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 206711 + ... + 215249.

It is an arithmetic number, because the mean of its divisors is an integer number (49497840).

Almost surely, 2^1801558220 is an apocalyptic number.

1801558220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1801558220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2375896320).

1801558220 is an abundant number, since it is smaller than the sum of its proper divisors (2950234420).

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

1801558220 is a wasteful number, since it uses less digits than its factorization.

1801558220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8703 (or 8701 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 32.

The square root of 1801558220 is about 42444.7666974387. The cubic root of 1801558220 is about 1216.7913130152.

The spelling of 1801558220 in words is "one billion, eight hundred one million, five hundred fifty-eight thousand, two hundred twenty".