26864400020 has 12 divisors (see below), whose sum is σ = 56415240084. Its totient is φ = 10745760000.

The previous prime is 26864399983. The next prime is 26864400047. The reversal of 26864400020 is 2000446862.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6821768836 + 20042631184 = 82594^2 + 141572^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 26864400020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 671609981 + ... + 671610020.

It is an arithmetic number, because the mean of its divisors is an integer number (4701270007).

Almost surely, 2^26864400020 is an apocalyptic number.

26864400020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26864400020 is an abundant number, since it is smaller than the sum of its proper divisors (29550840064).

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

26864400020 is a wasteful number, since it uses less digits than its factorization.

26864400020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343220010 (or 1343220008 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

Adding to 26864400020 its reverse (2000446862), we get a palindrome (28864846882).

The spelling of 26864400020 in words is "twenty-six billion, eight hundred sixty-four million, four hundred thousand, twenty".