1605213020 has 12 divisors (see below), whose sum is σ = 3370947384. Its totient is φ = 642085200.

The previous prime is 1605213019. The next prime is 1605213023. The reversal of 1605213020 is 203125061.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 80260651 = 1605213020 / (1 + 6 + 0 + 5 + 2 + 1 + 3 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1605212983 and 1605213001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605213023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40130306 + ... + 40130345.

It is an arithmetic number, because the mean of its divisors is an integer number (280912282).

Almost surely, 2^1605213020 is an apocalyptic number.

1605213020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1605213020 is an abundant number, since it is smaller than the sum of its proper divisors (1765734364).

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

1605213020 is a wasteful number, since it uses less digits than its factorization.

1605213020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80260660 (or 80260658 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1605213020 is about 40065.1097589911. The cubic root of 1605213020 is about 1170.8759651429.

Adding to 1605213020 its reverse (203125061), we get a palindrome (1808338081).

The spelling of 1605213020 in words is "one billion, six hundred five million, two hundred thirteen thousand, twenty".