20021200120 has 64 divisors (see below), whose sum is σ = 45447415200. Its totient is φ = 7937717760.

The previous prime is 20021200117. The next prime is 20021200141. The reversal of 20021200120 is 2100212002.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20021200097 and 20021200106.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2265310 + ... + 2274130.

Almost surely, 2^20021200120 is an apocalyptic number.

20021200120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021200120 is an abundant number, since it is smaller than the sum of its proper divisors (25426215080).

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

20021200120 is a wasteful number, since it uses less digits than its factorization.

20021200120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9328 (or 9324 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20021200120 its reverse (2100212002), we get a palindrome (22121412122).

The spelling of 20021200120 in words is "twenty billion, twenty-one million, two hundred thousand, one hundred twenty".