1820620800 has 360 divisors, whose sum is σ = 6758551800. Its totient is φ = 484392960.

The previous prime is 1820620799. The next prime is 1820620829. The reversal of 1820620800 is 80260281.

1820620800 is a `hidden beast` number, since 18 + 20 + 620 + 8 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 4146981 + ... + 4147419.

It is an arithmetic number, because the mean of its divisors is an integer number (18773755).

Almost surely, 2^1820620800 is an apocalyptic number.

1820620800 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 1820620800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3379275900).

1820620800 is an abundant number, since it is smaller than the sum of its proper divisors (4937931000).

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

1820620800 is an equidigital number, since it uses as much as digits as its factorization.

1820620800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483 (or 449 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 1820620800 is about 42668.7332832837. The cubic root of 1820620800 is about 1221.0679531632.

The spelling of 1820620800 in words is "one billion, eight hundred twenty million, six hundred twenty thousand, eight hundred".