16663620 has 48 divisors (see below), whose sum is σ = 46932480. Its totient is φ = 4417536.

The previous prime is 16663613. The next prime is 16663631. The reversal of 16663620 is 2636661.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10861 + ... + 12299.

It is an arithmetic number, because the mean of its divisors is an integer number (977760).

Almost surely, 2^16663620 is an apocalyptic number.

16663620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16663620 is an abundant number, since it is smaller than the sum of its proper divisors (30268860).

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

16663620 is a wasteful number, since it uses less digits than its factorization.

16663620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644 (or 1642 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 16663620 is about 4082.1097486471. The cubic root of 16663620 is about 255.4209119200.

The spelling of 16663620 in words is "sixteen million, six hundred sixty-three thousand, six hundred twenty".