20403866 has 8 divisors (see below), whose sum is σ = 34978080. Its totient is φ = 8744508.

The previous prime is 20403863. The next prime is 20403869. The reversal of 20403866 is 66830402.

It is an interprime number because it is at equal distance from previous prime (20403863) and next prime (20403869).

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20403863) 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, 728696 + ... + 728723.

It is an arithmetic number, because the mean of its divisors is an integer number (4372260).

Almost surely, 2^20403866 is an apocalyptic number.

20403866 is a deficient number, since it is larger than the sum of its proper divisors (14574214).

20403866 is a wasteful number, since it uses less digits than its factorization.

20403866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457428.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 20403866 is about 4517.0638693736. The cubic root of 20403866 is about 273.2567010369.

The spelling of 20403866 in words is "twenty million, four hundred three thousand, eight hundred sixty-six".