20120120100 has 108 divisors (see below), whose sum is σ = 64006865104. Its totient is φ = 5285269440.

The previous prime is 20120120099. The next prime is 20120120197. The reversal of 20120120100 is 102102102.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 106534 + ... + 227133.

Almost surely, 2^20120120100 is an apocalyptic number.

20120120100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20120120100 is an abundant number, since it is smaller than the sum of its proper divisors (43886745004).

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

20120120100 is a wasteful number, since it uses less digits than its factorization.

20120120100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333754 (or 333744 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20120120100 its reverse (102102102), we get a palindrome (20222222202).

The spelling of 20120120100 in words is "twenty billion, one hundred twenty million, one hundred twenty thousand, one hundred".