20604646440 has 96 divisors (see below), whose sum is σ = 76531553280. Its totient is φ = 4709632896.

The previous prime is 20604646417. The next prime is 20604646441. The reversal of 20604646440 is 4464640602.

It is a happy number.

20604646440 is a `hidden beast` number, since 2 + 0 + 6 + 0 + 4 + 6 + 4 + 644 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20604646395 and 20604646404.

It is not an unprimeable number, because it can be changed into a prime (20604646441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4085704 + ... + 4090743.

It is an arithmetic number, because the mean of its divisors is an integer number (797203680).

Almost surely, 2^20604646440 is an apocalyptic number.

20604646440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20604646440 is an abundant number, since it is smaller than the sum of its proper divisors (55926906840).

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

20604646440 is a wasteful number, since it uses less digits than its factorization.

20604646440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8176471 (or 8176464 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

The spelling of 20604646440 in words is "twenty billion, six hundred four million, six hundred forty-six thousand, four hundred forty".