20181824220 has 48 divisors (see below), whose sum is σ = 56915671680. Its totient is φ = 5343099456.

The previous prime is 20181824177. The next prime is 20181824231. The reversal of 20181824220 is 2242818102.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1201602 + ... + 1218281.

It is an arithmetic number, because the mean of its divisors is an integer number (1185743160).

Almost surely, 2^20181824220 is an apocalyptic number.

20181824220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20181824220 is an abundant number, since it is smaller than the sum of its proper divisors (36733847460).

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

20181824220 is a wasteful number, since it uses less digits than its factorization.

20181824220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2420034 (or 2420032 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 30.

The spelling of 20181824220 in words is "twenty billion, one hundred eighty-one million, eight hundred twenty-four thousand, two hundred twenty".