26640020 has 72 divisors (see below), whose sum is σ = 64985760. Its totient is φ = 9095680.

The previous prime is 26640017. The next prime is 26640041. The reversal of 26640020 is 2004662.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 26639974 and 26640001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63371 + ... + 63789.

It is an arithmetic number, because the mean of its divisors is an integer number (902580).

Almost surely, 2^26640020 is an apocalyptic number.

26640020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26640020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32492880).

26640020 is an abundant number, since it is smaller than the sum of its proper divisors (38345740).

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

26640020 is a wasteful number, since it uses less digits than its factorization.

26640020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473 (or 454 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 26640020 is about 5161.3970976859. The cubic root of 26640020 is about 298.6607711908.

Adding to 26640020 its reverse (2004662), we get a palindrome (28644682).

It can be divided in two parts, 26 and 640020, that added together give a palindrome (640046).

The spelling of 26640020 in words is "twenty-six million, six hundred forty thousand, twenty".