6406020 has 48 divisors (see below), whose sum is σ = 19931520. Its totient is φ = 1708128.

The previous prime is 6405989. The next prime is 6406051. The reversal of 6406020 is 206046.

Added to its reverse (206046) it gives a triangular number (6612066 = T₃₆₃₆).

6406020 is a `hidden beast` number, since 64 + 0 + 602 + 0 = 666.

6406020 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (6405989) and next prime (6406051).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 6405984 and 6406002.

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, 5392 + ... + 6471.

It is an arithmetic number, because the mean of its divisors is an integer number (415240).

Almost surely, 2^6406020 is an apocalyptic number.

6406020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6406020 is an abundant number, since it is smaller than the sum of its proper divisors (13525500).

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

6406020 is a wasteful number, since it uses less digits than its factorization.

6406020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11881 (or 11873 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 6406020 is about 2531.0116554453. The cubic root of 6406020 is about 185.7217483617.

Adding to 6406020 its reverse (206046), we get a triangular number (6612066 = T₃₆₃₆).

The spelling of 6406020 in words is "six million, four hundred six thousand, twenty".