1685216020 has 96 divisors (see below), whose sum is σ = 3835077120. Its totient is φ = 620006400.

The previous prime is 1685215919. The next prime is 1685216107. The reversal of 1685216020 is 206125861.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2803720 + ... + 2804320.

It is an arithmetic number, because the mean of its divisors is an integer number (39948720).

Almost surely, 2^1685216020 is an apocalyptic number.

1685216020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1685216020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1917538560).

1685216020 is an abundant number, since it is smaller than the sum of its proper divisors (2149861100).

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

1685216020 is a wasteful number, since it uses less digits than its factorization.

1685216020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833 (or 831 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 1685216020 is about 41051.3826807332. The cubic root of 1685216020 is about 1190.0134216879.

The spelling of 1685216020 in words is "one billion, six hundred eighty-five million, two hundred sixteen thousand, twenty".