18863801220 has 48 divisors (see below), whose sum is σ = 57620340288. Its totient is φ = 4573042560.

The previous prime is 18863801219. The next prime is 18863801221. The reversal of 18863801220 is 2210836881.

It is an interprime number because it is at equal distance from previous prime (18863801219) and next prime (18863801221).

It is not an unprimeable number, because it can be changed into a prime (18863801221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14290099 + ... + 14291418.

It is an arithmetic number, because the mean of its divisors is an integer number (1200423756).

Almost surely, 2^18863801220 is an apocalyptic number.

18863801220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18863801220 is an abundant number, since it is smaller than the sum of its proper divisors (38756539068).

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

18863801220 is a wasteful number, since it uses less digits than its factorization.

18863801220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28581540 (or 28581538 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 39.

The spelling of 18863801220 in words is "eighteen billion, eight hundred sixty-three million, eight hundred one thousand, two hundred twenty".