20010666 has 32 divisors (see below), whose sum is σ = 45638208. Its totient is φ = 5794560.

The previous prime is 20010637. The next prime is 20010691. The reversal of 20010666 is 66601002.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6220 + ... + 8871.

It is an arithmetic number, because the mean of its divisors is an integer number (1426194).

Almost surely, 2^20010666 is an apocalyptic number.

20010666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20010666 is an abundant number, since it is smaller than the sum of its proper divisors (25627542).

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

20010666 is a wasteful number, since it uses less digits than its factorization.

20010666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15126.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 20010666 is about 4473.3282911050. The cubic root of 20010666 is about 271.4900063814.

Adding to 20010666 its reverse (66601002), we get a palindrome (86611668).

The spelling of 20010666 in words is "twenty million, ten thousand, six hundred sixty-six".