26645620220 has 24 divisors (see below), whose sum is σ = 55998280800. Its totient is φ = 10650156992.

The previous prime is 26645620219. The next prime is 26645620223. The reversal of 26645620220 is 2202654662.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26645620223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 478655 + ... + 531414.

It is an arithmetic number, because the mean of its divisors is an integer number (2333261700).

Almost surely, 2^26645620220 is an apocalyptic number.

26645620220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26645620220 is an abundant number, since it is smaller than the sum of its proper divisors (29352660580).

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

26645620220 is a wasteful number, since it uses less digits than its factorization.

26645620220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011397 (or 1011395 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The spelling of 26645620220 in words is "twenty-six billion, six hundred forty-five million, six hundred twenty thousand, two hundred twenty".