20018583820 has 24 divisors (see below), whose sum is σ = 42042646800. Its totient is φ = 8006743872.

The previous prime is 20018583779. The next prime is 20018583821. The reversal of 20018583820 is 2838581002.

It is a self number, because there is not a number n which added to its sum of digits gives 20018583820.

It is not an unprimeable number, because it can be changed into a prime (20018583821) 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, 240391 + ... + 312769.

It is an arithmetic number, because the mean of its divisors is an integer number (1751776950).

Almost surely, 2^20018583820 is an apocalyptic number.

20018583820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20018583820 is an abundant number, since it is smaller than the sum of its proper divisors (22024062980).

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

20018583820 is a wasteful number, since it uses less digits than its factorization.

20018583820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86217 (or 86215 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 37.

The spelling of 20018583820 in words is "twenty billion, eighteen million, five hundred eighty-three thousand, eight hundred twenty".