20641024 has 18 divisors (see below), whose sum is σ = 41201930. Its totient is φ = 10320384.

The previous prime is 20641013. The next prime is 20641039. The reversal of 20641024 is 42014602.

It can be written as a sum of positive squares in only one way, i.e., 17977600 + 2663424 = 4240^2 + 1632^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20640992 and 20641010.

It is a congruent number.

It is an unprimeable number.

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, 40059 + ... + 40570.

Almost surely, 2^20641024 is an apocalyptic number.

It is an amenable number.

20641024 is a deficient number, since it is larger than the sum of its proper divisors (20560906).

20641024 is an frugal number, since it uses more digits than its factorization.

20641024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80645 (or 80631 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 20641024 is about 4543.2393729585. The cubic root of 20641024 is about 274.3113302796.

Adding to 20641024 its reverse (42014602), we get a palindrome (62655626).

The spelling of 20641024 in words is "twenty million, six hundred forty-one thousand, twenty-four".