20608880440 has 32 divisors (see below), whose sum is σ = 48386069280. Its totient is φ = 7885136512.

The previous prime is 20608880431. The next prime is 20608880447. The reversal of 20608880440 is 4408880602.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 20608880393 and 20608880402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20608880447) 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, 11199559 + ... + 11201398.

It is an arithmetic number, because the mean of its divisors is an integer number (1512064665).

Almost surely, 2^20608880440 is an apocalyptic number.

20608880440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20608880440 is an abundant number, since it is smaller than the sum of its proper divisors (27777188840).

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

20608880440 is a wasteful number, since it uses less digits than its factorization.

20608880440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22400991 (or 22400987 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 40.

The spelling of 20608880440 in words is "twenty billion, six hundred eight million, eight hundred eighty thousand, four hundred forty".