201909291820 has 12 divisors (see below), whose sum is σ = 424009512864. Its totient is φ = 80763716720.

The previous prime is 201909291797. The next prime is 201909291821. The reversal of 201909291820 is 28192909102.

201909291820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (201909291821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5047732276 + ... + 5047732315.

It is an arithmetic number, because the mean of its divisors is an integer number (35334126072).

Almost surely, 2^201909291820 is an apocalyptic number.

201909291820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201909291820 is an abundant number, since it is smaller than the sum of its proper divisors (222100221044).

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

201909291820 is a wasteful number, since it uses less digits than its factorization.

201909291820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10095464600 (or 10095464598 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 43.

The spelling of 201909291820 in words is "two hundred one billion, nine hundred nine million, two hundred ninety-one thousand, eight hundred twenty".