20440064 has 22 divisors (see below), whose sum is σ = 40862214. Its totient is φ = 10219520.

The previous prime is 20440039. The next prime is 20440109. The reversal of 20440064 is 46004402.

It can be written as a sum of positive squares in only one way, i.e., 20070400 + 369664 = 4480^2 + 608^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8957 + ... + 11004.

Almost surely, 2^20440064 is an apocalyptic number.

It is an amenable number.

20440064 is a deficient number, since it is larger than the sum of its proper divisors (20422150).

20440064 is an equidigital number, since it uses as much as digits as its factorization.

20440064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19981 (or 19963 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 20440064 is about 4521.0689001607. The cubic root of 20440064 is about 273.4181982501.

Adding to 20440064 its reverse (46004402), we get a palindrome (66444466).

The spelling of 20440064 in words is "twenty million, four hundred forty thousand, sixty-four".