205647270520 has 64 divisors (see below), whose sum is σ = 479140012800. Its totient is φ = 79354122240.

The previous prime is 205647270511. The next prime is 205647270547. The reversal of 205647270520 is 25072746502.

It is a super-2 number, since 2×205647270520² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131496 + ... + 654664.

It is an arithmetic number, because the mean of its divisors is an integer number (7486562700).

Almost surely, 2^205647270520 is an apocalyptic number.

205647270520 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 205647270520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239570006400).

205647270520 is an abundant number, since it is smaller than the sum of its proper divisors (273492742280).

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

205647270520 is a wasteful number, since it uses less digits than its factorization.

205647270520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523528 (or 523524 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 40.

The spelling of 205647270520 in words is "two hundred five billion, six hundred forty-seven million, two hundred seventy thousand, five hundred twenty".