1663600020 has 24 divisors (see below), whose sum is σ = 4658080224. Its totient is φ = 443626656.

The previous prime is 1663600019. The next prime is 1663600021. The reversal of 1663600020 is 200063661.

It is an interprime number because it is at equal distance from previous prime (1663600019) and next prime (1663600021).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663600021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13863274 + ... + 13863393.

It is an arithmetic number, because the mean of its divisors is an integer number (194086676).

Almost surely, 2^1663600020 is an apocalyptic number.

1663600020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1663600020 is an abundant number, since it is smaller than the sum of its proper divisors (2994480204).

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

1663600020 is a wasteful number, since it uses less digits than its factorization.

1663600020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27726679 (or 27726677 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 1663600020 is about 40787.2531558574. The cubic root of 1663600020 is about 1184.9034727049.

Adding to 1663600020 its reverse (200063661), we get a palindrome (1863663681).

The spelling of 1663600020 in words is "one billion, six hundred sixty-three million, six hundred thousand, twenty".