20442688 has 28 divisors (see below), whose sum is σ = 46362112. Its totient is φ = 8760960.

The previous prime is 20442661. The next prime is 20442691. The reversal of 20442688 is 88624402.

It is a tau number, because it is divible by the number of its divisors (28).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22368 + ... + 23263.

Almost surely, 2^20442688 is an apocalyptic number.

20442688 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20442688 is an abundant number, since it is smaller than the sum of its proper divisors (25919424).

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

20442688 is an equidigital number, since it uses as much as digits as its factorization.

20442688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45650 (or 45640 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 34.

The square root of 20442688 is about 4521.3590877080. The cubic root of 20442688 is about 273.4298978001.

The spelling of 20442688 in words is "twenty million, four hundred forty-two thousand, six hundred eighty-eight".