20249966 has 16 divisors (see below), whose sum is σ = 33212160. Its totient is φ = 9183480.

The previous prime is 20249963. The next prime is 20249969. The reversal of 20249966 is 66994202.

It is an interprime number because it is at equal distance from previous prime (20249963) and next prime (20249969).

It is a super-2 number, since 2×20249966² = 820122246002312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20249963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12875 + ... + 14361.

It is an arithmetic number, because the mean of its divisors is an integer number (2075760).

Almost surely, 2^20249966 is an apocalyptic number.

20249966 is a deficient number, since it is larger than the sum of its proper divisors (12962194).

20249966 is a wasteful number, since it uses less digits than its factorization.

20249966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2119.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 20249966 is about 4499.9962222206. The cubic root of 20249966 is about 272.5679363763.

The spelling of 20249966 in words is "twenty million, two hundred forty-nine thousand, nine hundred sixty-six".