20907866 has 32 divisors (see below), whose sum is σ = 38223360. Its totient is φ = 8377776.

The previous prime is 20907863. The next prime is 20907877. The reversal of 20907866 is 66870902.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (20907863) 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, 21605 + ... + 22551.

It is an arithmetic number, because the mean of its divisors is an integer number (1194480).

Almost surely, 2^20907866 is an apocalyptic number.

20907866 is a deficient number, since it is larger than the sum of its proper divisors (17315494).

20907866 is a wasteful number, since it uses less digits than its factorization.

20907866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 20907866 is about 4572.5120010777. The cubic root of 20907866 is about 275.4883487990.

The spelling of 20907866 in words is "twenty million, nine hundred seven thousand, eight hundred sixty-six".