201780620 has 24 divisors (see below), whose sum is σ = 424116000. Its totient is φ = 80640512.

The previous prime is 201780611. The next prime is 201780629. The reversal of 201780620 is 26087102.

It is an interprime number because it is at equal distance from previous prime (201780611) and next prime (201780629).

It is a self number, because there is not a number n which added to its sum of digits gives 201780620.

It is not an unprimeable number, because it can be changed into a prime (201780629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22556 + ... + 30204.

It is an arithmetic number, because the mean of its divisors is an integer number (17671500).

Almost surely, 2^201780620 is an apocalyptic number.

201780620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201780620 is an abundant number, since it is smaller than the sum of its proper divisors (222335380).

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

201780620 is a wasteful number, since it uses less digits than its factorization.

201780620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8977 (or 8975 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 201780620 is about 14204.9505454965. The cubic root of 201780620 is about 586.5339439488.

The spelling of 201780620 in words is "two hundred one million, seven hundred eighty thousand, six hundred twenty".