20066681 has 16 divisors (see below), whose sum is σ = 22042944. Its totient is φ = 18192384.

The previous prime is 20066639. The next prime is 20066687. The reversal of 20066681 is 18666002.

It is a cyclic number.

It is not a de Polignac number, because 20066681 - 2¹⁰ = 20065657 is a prime.

It is a super-2 number, since 2×20066681² = 805343372711522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20066687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70766 + ... + 71048.

It is an arithmetic number, because the mean of its divisors is an integer number (1377684).

Almost surely, 2^20066681 is an apocalyptic number.

It is an amenable number.

20066681 is a deficient number, since it is larger than the sum of its proper divisors (1976263).

20066681 is a wasteful number, since it uses less digits than its factorization.

20066681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20066681 is about 4479.5849138062. The cubic root of 20066681 is about 271.7430938235.

The spelling of 20066681 in words is "twenty million, sixty-six thousand, six hundred eighty-one".