20245664 has 12 divisors (see below), whose sum is σ = 39858714. Its totient is φ = 10122816.

The previous prime is 20245651. The next prime is 20245669. The reversal of 20245664 is 46654202.

It can be written as a sum of positive squares in only one way, i.e., 20178064 + 67600 = 4492^2 + 260^2 .

It is not an unprimeable number, because it can be changed into a prime (20245669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316307 + ... + 316370.

Almost surely, 2^20245664 is an apocalyptic number.

It is an amenable number.

20245664 is a deficient number, since it is larger than the sum of its proper divisors (19613050).

20245664 is an equidigital number, since it uses as much as digits as its factorization.

20245664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632687 (or 632679 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 20245664 is about 4499.5181964295. The cubic root of 20245664 is about 272.5486331290.

Adding to 20245664 its reverse (46654202), we get a palindrome (66899866).

The spelling of 20245664 in words is "twenty million, two hundred forty-five thousand, six hundred sixty-four".