18705918924 has 384 divisors, whose sum is σ = 64377815040. Its totient is φ = 4547404800.

The previous prime is 18705918919. The next prime is 18705918983. The reversal of 18705918924 is 42981950781.

It is a happy number.

It is a super-2 number, since 2×18705918924² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 43400989 + ... + 43401419.

It is an arithmetic number, because the mean of its divisors is an integer number (167650560).

Almost surely, 2^18705918924 is an apocalyptic number.

18705918924 is a gapful number since it is divisible by the number (14) 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 18705918924, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32188907520).

18705918924 is an abundant number, since it is smaller than the sum of its proper divisors (45671896116).

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

18705918924 is a wasteful number, since it uses less digits than its factorization.

18705918924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786 (or 778 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 54.

The spelling of 18705918924 in words is "eighteen billion, seven hundred five million, nine hundred eighteen thousand, nine hundred twenty-four".