18461037420 has 288 divisors, whose sum is σ = 65100672000. Its totient is φ = 4147656192.

The previous prime is 18461037407. The next prime is 18461037421. The reversal of 18461037420 is 2473016481.

18461037420 is a `hidden beast` number, since 1 + 8 + 4 + 610 + 37 + 4 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18461037421) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 20087721 + ... + 20088639.

It is an arithmetic number, because the mean of its divisors is an integer number (226044000).

Almost surely, 2^18461037420 is an apocalyptic number.

18461037420 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 18461037420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32550336000).

18461037420 is an abundant number, since it is smaller than the sum of its proper divisors (46639634580).

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

18461037420 is a wasteful number, since it uses less digits than its factorization.

18461037420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1197 (or 1192 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The spelling of 18461037420 in words is "eighteen billion, four hundred sixty-one million, thirty-seven thousand, four hundred twenty".