20120220 has 36 divisors (see below), whose sum is σ = 61031880. Its totient is φ = 5365344.

The previous prime is 20120213. The next prime is 20120237. The reversal of 20120220 is 2202102.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55710 + ... + 56069.

It is an arithmetic number, because the mean of its divisors is an integer number (1695330).

Almost surely, 2^20120220 is an apocalyptic number.

20120220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20120220 is an abundant number, since it is smaller than the sum of its proper divisors (40911660).

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

20120220 is a wasteful number, since it uses less digits than its factorization.

20120220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111794 (or 111789 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 20120220 is about 4485.5568216220. The cubic root of 20120220 is about 271.9845543421.

Adding to 20120220 its reverse (2202102), we get a palindrome (22322322).

The spelling of 20120220 in words is "twenty million, one hundred twenty thousand, two hundred twenty".