18206885420 has 96 divisors (see below), whose sum is σ = 42208423488. Its totient is φ = 6568353792.

The previous prime is 18206885401. The next prime is 18206885423. The reversal of 18206885420 is 2458860281.

It is not an unprimeable number, because it can be changed into a prime (18206885423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 763112 + ... + 786608.

It is an arithmetic number, because the mean of its divisors is an integer number (439671078).

Almost surely, 2^18206885420 is an apocalyptic number.

18206885420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18206885420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21104211744).

18206885420 is an abundant number, since it is smaller than the sum of its proper divisors (24001538068).

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

18206885420 is a wasteful number, since it uses less digits than its factorization.

18206885420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23619 (or 23617 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 44.

The spelling of 18206885420 in words is "eighteen billion, two hundred six million, eight hundred eighty-five thousand, four hundred twenty".