201858401820 has 48 divisors (see below), whose sum is σ = 566718878880. Its totient is φ = 53684587776.

The previous prime is 201858401813. The next prime is 201858401831. The reversal of 201858401820 is 28104858102.

201858401820 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4487415 + ... + 4532174.

It is an arithmetic number, because the mean of its divisors is an integer number (11806643310).

Almost surely, 2^201858401820 is an apocalyptic number.

201858401820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201858401820 is an abundant number, since it is smaller than the sum of its proper divisors (364860477060).

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

201858401820 is a wasteful number, since it uses less digits than its factorization.

201858401820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9019974 (or 9019972 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 39.

The spelling of 201858401820 in words is "two hundred one billion, eight hundred fifty-eight million, four hundred one thousand, eight hundred twenty".