20201220120 has 64 divisors (see below), whose sum is σ = 60663385440. Its totient is φ = 5381683200.

The previous prime is 20201220119. The next prime is 20201220157. The reversal of 20201220120 is 2102210202.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20201220096 and 20201220105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40080 + ... + 204960.

Almost surely, 2^20201220120 is an apocalyptic number.

20201220120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20201220120 is an abundant number, since it is smaller than the sum of its proper divisors (40462165320).

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

20201220120 is a wasteful number, since it uses less digits than its factorization.

20201220120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165916 (or 165912 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20201220120 its reverse (2102210202), we get a palindrome (22303430322).

The spelling of 20201220120 in words is "twenty billion, two hundred one million, two hundred twenty thousand, one hundred twenty".