2001249820 has 12 divisors (see below), whose sum is σ = 4202624664. Its totient is φ = 800499920.

The previous prime is 2001249797. The next prime is 2001249827. The reversal of 2001249820 is 289421002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001249827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50031226 + ... + 50031265.

It is an arithmetic number, because the mean of its divisors is an integer number (350218722).

Almost surely, 2^2001249820 is an apocalyptic number.

2001249820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001249820 is an abundant number, since it is smaller than the sum of its proper divisors (2201374844).

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

2001249820 is a wasteful number, since it uses less digits than its factorization.

2001249820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100062500 (or 100062498 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 2001249820 is about 44735.3307800445. The cubic root of 2001249820 is about 1260.1834409999.

The spelling of 2001249820 in words is "two billion, one million, two hundred forty-nine thousand, eight hundred twenty".