1020240405 has 36 divisors (see below), whose sum is σ = 1817613252. Its totient is φ = 529390080.

The previous prime is 1020240343. The next prime is 1020240413. The reversal of 1020240405 is 5040420201.

1020240405 is a `hidden beast` number, since 1 + 0 + 20 + 240 + 405 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 9381969 + 1010858436 = 3063^2 + 31794^2 .

It is not a de Polignac number, because 1020240405 - 2⁶ = 1020240341 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 53325 + ... + 69885.

It is an arithmetic number, because the mean of its divisors is an integer number (50489257).

Almost surely, 2^1020240405 is an apocalyptic number.

1020240405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1020240405 is a deficient number, since it is larger than the sum of its proper divisors (797372847).

1020240405 is a wasteful number, since it uses less digits than its factorization.

1020240405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16646 (or 16606 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 1020240405 is about 31941.2023098693. The cubic root of 1020240405 is about 1006.7017873780.

Adding to 1020240405 its reverse (5040420201), we get a palindrome (6060660606).

The spelling of 1020240405 in words is "one billion, twenty million, two hundred forty thousand, four hundred five".