20664342 has 32 divisors (see below), whose sum is σ = 46130400. Its totient is φ = 6856704.

The previous prime is 20664313. The next prime is 20664353. The reversal of 20664342 is 24346602.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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, 13134 + ... + 14622.

It is an arithmetic number, because the mean of its divisors is an integer number (1441575).

Almost surely, 2^20664342 is an apocalyptic number.

20664342 is an abundant number, since it is smaller than the sum of its proper divisors (25466058).

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

20664342 is a wasteful number, since it uses less digits than its factorization.

20664342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1757 (or 1751 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 20664342 is about 4545.8048792266. The cubic root of 20664342 is about 274.4145871797.

The spelling of 20664342 in words is "twenty million, six hundred sixty-four thousand, three hundred forty-two".