1663020 has 36 divisors (see below), whose sum is σ = 5045040. Its totient is φ = 443424.

The previous prime is 1663009. The next prime is 1663027. The reversal of 1663020 is 203661.

It is a happy number.

1663020 is a `hidden beast` number, since 1 + 663 + 0 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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 = 1662984 and 1663002.

It is not an unprimeable number, because it can be changed into a prime (1663027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4440 + ... + 4799.

It is an arithmetic number, because the mean of its divisors is an integer number (140140).

2^1663020 is an apocalyptic number.

1663020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1663020 is an abundant number, since it is smaller than the sum of its proper divisors (3382020).

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

1663020 is a wasteful number, since it uses less digits than its factorization.

1663020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9254 (or 9249 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1663020 is about 1289.5813274082. The cubic root of 1663020 is about 118.4765749776.

Adding to 1663020 its reverse (203661), we get a palindrome (1866681).

It can be divided in two parts, 16 and 63020, that added together give a palindrome (63036).

The spelling of 1663020 in words is "one million, six hundred sixty-three thousand, twenty".