202001220 has 72 divisors (see below), whose sum is σ = 621171096. Its totient is φ = 53125632.

The previous prime is 202001213. The next prime is 202001251. The reversal of 202001220 is 22100202.

It can be written as a sum of positive squares in 4 ways, for example, as 133956 + 201867264 = 366^2 + 14208^2 .

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 23 ways as a sum of consecutive naturals, for example, 5454 + ... + 20826.

Almost surely, 2^202001220 is an apocalyptic number.

202001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 202001220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (310585548).

202001220 is an abundant number, since it is smaller than the sum of its proper divisors (419169876).

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

202001220 is a wasteful number, since it uses less digits than its factorization.

202001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15461 (or 15456 counting only the distinct ones).

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

The square root of 202001220 is about 14212.7133229373. The cubic root of 202001220 is about 586.7476120806.

Adding to 202001220 its reverse (22100202), we get a palindrome (224101422).

The spelling of 202001220 in words is "two hundred two million, one thousand, two hundred twenty".