1605420420 has 24 divisors (see below), whose sum is σ = 4495177344. Its totient is φ = 428112096.

The previous prime is 1605420353. The next prime is 1605420431. The reversal of 1605420420 is 240245061.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13378444 + ... + 13378563.

It is an arithmetic number, because the mean of its divisors is an integer number (187299056).

Almost surely, 2^1605420420 is an apocalyptic number.

1605420420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1605420420 is an abundant number, since it is smaller than the sum of its proper divisors (2889756924).

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

1605420420 is a wasteful number, since it uses less digits than its factorization.

1605420420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26757019 (or 26757017 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1605420420 is about 40067.6979623237. The cubic root of 1605420420 is about 1170.9263902712.

Adding to 1605420420 its reverse (240245061), we get a palindrome (1845665481).

The spelling of 1605420420 in words is "one billion, six hundred five million, four hundred twenty thousand, four hundred twenty".