20218547620 has 24 divisors (see below), whose sum is σ = 42696158400. Its totient is φ = 8042236512.

The previous prime is 20218547617. The next prime is 20218547633. The reversal of 20218547620 is 2674581202.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20218547620.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2820240 + ... + 2827399.

It is an arithmetic number, because the mean of its divisors is an integer number (1779006600).

Almost surely, 2^20218547620 is an apocalyptic number.

20218547620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20218547620 is an abundant number, since it is smaller than the sum of its proper divisors (22477610780).

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

20218547620 is a wasteful number, since it uses less digits than its factorization.

20218547620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5647827 (or 5647825 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The spelling of 20218547620 in words is "twenty billion, two hundred eighteen million, five hundred forty-seven thousand, six hundred twenty".