2001854563820 has 24 divisors (see below), whose sum is σ = 4204031621328. Its totient is φ = 800715723200.

The previous prime is 2001854563757. The next prime is 2001854563871. The reversal of 2001854563820 is 283654581002.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 996491 + ... + 2235330.

It is an arithmetic number, because the mean of its divisors is an integer number (175167984222).

Almost surely, 2^{2001854563820} is an apocalyptic number.

2001854563820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001854563820 is an abundant number, since it is smaller than the sum of its proper divisors (2202177057508).

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

2001854563820 is a wasteful number, since it uses less digits than its factorization.

2001854563820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3262801 (or 3262799 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 44.

The spelling of 2001854563820 in words is "two trillion, one billion, eight hundred fifty-four million, five hundred sixty-three thousand, eight hundred twenty".