201557620 has 96 divisors (see below), whose sum is σ = 478711296. Its totient is φ = 70656000.

The previous prime is 201557591. The next prime is 201557639. The reversal of 201557620 is 26755102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1044244 + ... + 1044436.

It is an arithmetic number, because the mean of its divisors is an integer number (4986576).

Almost surely, 2^201557620 is an apocalyptic number.

201557620 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 201557620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239355648).

201557620 is an abundant number, since it is smaller than the sum of its proper divisors (277153676).

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

201557620 is a wasteful number, since it uses less digits than its factorization.

201557620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361 (or 359 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 201557620 is about 14197.0989994435. The cubic root of 201557620 is about 586.3177928916.

The spelling of 201557620 in words is "two hundred one million, five hundred fifty-seven thousand, six hundred twenty".