20210220 has 36 divisors (see below), whose sum is σ = 61304880. Its totient is φ = 5389344.

The previous prime is 20210189. The next prime is 20210237. The reversal of 20210220 is 2201202.

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, 55960 + ... + 56319.

Almost surely, 2^20210220 is an apocalyptic number.

20210220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20210220 is an abundant number, since it is smaller than the sum of its proper divisors (41094660).

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

20210220 is a wasteful number, since it uses less digits than its factorization.

20210220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112294 (or 112289 counting only the distinct ones).

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

The square root of 20210220 is about 4495.5778271541. The cubic root of 20210220 is about 272.3894903020.

Adding to 20210220 its reverse (2201202), we get a palindrome (22411422).

The spelling of 20210220 in words is "twenty million, two hundred ten thousand, two hundred twenty".