205570764420 has 48 divisors (see below), whose sum is σ = 657826447488. Its totient is φ = 46987603200.

The previous prime is 205570764367. The next prime is 205570764431. The reversal of 205570764420 is 24467075502.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244726681 + ... + 244727520.

It is an arithmetic number, because the mean of its divisors is an integer number (13704717656).

Almost surely, 2^205570764420 is an apocalyptic number.

205570764420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205570764420 is an abundant number, since it is smaller than the sum of its proper divisors (452255683068).

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

205570764420 is a wasteful number, since it uses less digits than its factorization.

205570764420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489454220 (or 489454218 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 42.

The spelling of 205570764420 in words is "two hundred five billion, five hundred seventy million, seven hundred sixty-four thousand, four hundred twenty".