3820520 has 64 divisors (see below), whose sum is σ = 9892800. Its totient is φ = 1313280.

The previous prime is 3820517. The next prime is 3820543. The reversal of 3820520 is 250283.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 3820492 and 3820501.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8132 + ... + 8588.

It is an arithmetic number, because the mean of its divisors is an integer number (154575).

Almost surely, 2^3820520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3820520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4946400).

3820520 is an abundant number, since it is smaller than the sum of its proper divisors (6072280).

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

3820520 is a wasteful number, since it uses less digits than its factorization.

3820520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 3820520 is about 1954.6150516150. The cubic root of 3820520 is about 156.3294593183.

The spelling of 3820520 in words is "three million, eight hundred twenty thousand, five hundred twenty".