120101820 has 24 divisors (see below), whose sum is σ = 336285264. Its totient is φ = 32027136.

The previous prime is 120101819. The next prime is 120101857. The reversal of 120101820 is 28101021.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 120101820.

It is a congruent number.

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, 1000789 + ... + 1000908.

It is an arithmetic number, because the mean of its divisors is an integer number (14011886).

Almost surely, 2^120101820 is an apocalyptic number.

120101820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

120101820 is an abundant number, since it is smaller than the sum of its proper divisors (216183444).

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

120101820 is a wasteful number, since it uses less digits than its factorization.

120101820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2001709 (or 2001707 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 120101820 is about 10959.0975905866. The cubic root of 120101820 is about 493.3818808242.

Adding to 120101820 its reverse (28101021), we get a palindrome (148202841).

The spelling of 120101820 in words is "one hundred twenty million, one hundred one thousand, eight hundred twenty".