205521372 has 72 divisors (see below), whose sum is σ = 598162656. Its totient is φ = 58281984.

The previous prime is 205521343. The next prime is 205521373. The reversal of 205521372 is 273125502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205521373) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31548 + ... + 37500.

Almost surely, 2^205521372 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 205521372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299081328).

205521372 is an abundant number, since it is smaller than the sum of its proper divisors (392641284).

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

205521372 is a wasteful number, since it uses less digits than its factorization.

205521372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6107 (or 6102 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 205521372 is about 14336.0166015529. The cubic root of 205521372 is about 590.1363009810.

Adding to 205521372 its reverse (273125502), we get a palindrome (478646874).

The spelling of 205521372 in words is "two hundred five million, five hundred twenty-one thousand, three hundred seventy-two".