20249946 has 64 divisors (see below), whose sum is σ = 47491200. Its totient is φ = 6386688.

The previous prime is 20249893. The next prime is 20249963. The reversal of 20249946 is 64994202.

It is a self number, because there is not a number n which added to its sum of digits gives 20249946.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104826 + ... + 105018.

It is an arithmetic number, because the mean of its divisors is an integer number (742050).

Almost surely, 2^20249946 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20249946, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23745600).

20249946 is an abundant number, since it is smaller than the sum of its proper divisors (27241254).

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

20249946 is a wasteful number, since it uses less digits than its factorization.

20249946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300 (or 294 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 20249946 is about 4499.9939999960. The cubic root of 20249946 is about 272.5678466419.

The spelling of 20249946 in words is "twenty million, two hundred forty-nine thousand, nine hundred forty-six".