20420666 has 8 divisors (see below), whose sum is σ = 35006880. Its totient is φ = 8751708.

The previous prime is 20420651. The next prime is 20420681. The reversal of 20420666 is 66602402.

It is an interprime number because it is at equal distance from previous prime (20420651) and next prime (20420681).

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

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, 729296 + ... + 729323.

It is an arithmetic number, because the mean of its divisors is an integer number (4375860).

Almost surely, 2^20420666 is an apocalyptic number.

20420666 is a deficient number, since it is larger than the sum of its proper divisors (14586214).

20420666 is a wasteful number, since it uses less digits than its factorization.

20420666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458628.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 20420666 is about 4518.9231018020. The cubic root of 20420666 is about 273.3316778933.

The spelling of 20420666 in words is "twenty million, four hundred twenty thousand, six hundred sixty-six".