20249644 has 6 divisors (see below), whose sum is σ = 35436884. Its totient is φ = 10124820.

The previous prime is 20249641. The next prime is 20249651. The reversal of 20249644 is 44694202.

It is not an unprimeable number, because it can be changed into a prime (20249641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2531202 + ... + 2531209.

Almost surely, 2^20249644 is an apocalyptic number.

It is an amenable number.

20249644 is a deficient number, since it is larger than the sum of its proper divisors (15187240).

20249644 is a wasteful number, since it uses less digits than its factorization.

20249644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5062415 (or 5062413 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 20249644 is about 4499.9604442706. The cubic root of 20249644 is about 272.5664916440.

The spelling of 20249644 in words is "twenty million, two hundred forty-nine thousand, six hundred forty-four".