205485020 has 24 divisors (see below), whose sum is σ = 464712864. Its totient is φ = 75871296.

The previous prime is 205485017. The next prime is 205485029. The reversal of 205485020 is 20584502.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205485029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394904 + ... + 395423.

It is an arithmetic number, because the mean of its divisors is an integer number (19363036).

Almost surely, 2^205485020 is an apocalyptic number.

205485020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205485020 is an abundant number, since it is smaller than the sum of its proper divisors (259227844).

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

205485020 is a wasteful number, since it uses less digits than its factorization.

205485020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790349 (or 790347 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 205485020 is about 14334.7486898097. The cubic root of 205485020 is about 590.1015050868.

The spelling of 205485020 in words is "two hundred five million, four hundred eighty-five thousand, twenty".