20330664 has 32 divisors (see below), whose sum is σ = 51148320. Its totient is φ = 6734016.

The previous prime is 20330647. The next prime is 20330671. The reversal of 20330664 is 46603302.

It is a Harshad number since it is a multiple of its sum of digits (24).

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 7 ways as a sum of consecutive naturals, for example, 1314 + ... + 6510.

It is an arithmetic number, because the mean of its divisors is an integer number (1598385).

Almost surely, 2^20330664 is an apocalyptic number.

20330664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20330664 is an abundant number, since it is smaller than the sum of its proper divisors (30817656).

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

20330664 is a wasteful number, since it uses less digits than its factorization.

20330664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5369 (or 5365 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

The square root of 20330664 is about 4508.9537589113. The cubic root of 20330664 is about 272.9295260132.

Adding to 20330664 its reverse (46603302), we get a palindrome (66933966).

The spelling of 20330664 in words is "twenty million, three hundred thirty thousand, six hundred sixty-four".