20442666 has 8 divisors (see below), whose sum is σ = 40885344. Its totient is φ = 6814220.

The previous prime is 20442661. The next prime is 20442691. The reversal of 20442666 is 66624402.

It is a sphenic number, since it is the product of 3 distinct primes.

20442666 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20442661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1703550 + ... + 1703561.

It is an arithmetic number, because the mean of its divisors is an integer number (5110668).

Almost surely, 2^20442666 is an apocalyptic number.

20442666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20442666 is a wasteful number, since it uses less digits than its factorization.

20442666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3407116.

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 20442666 is about 4521.3566548106. The cubic root of 20442666 is about 273.4297997135.

The spelling of 20442666 in words is "twenty million, four hundred forty-two thousand, six hundred sixty-six".