18956214420 has 192 divisors, whose sum is σ = 62546190336. Its totient is φ = 4229061120.

The previous prime is 18956214401. The next prime is 18956214439. The reversal of 18956214420 is 2441265981.

It is an interprime number because it is at equal distance from previous prime (18956214401) and next prime (18956214439).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2974077 + ... + 2980443.

It is an arithmetic number, because the mean of its divisors is an integer number (325761408).

Almost surely, 2^18956214420 is an apocalyptic number.

18956214420 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 18956214420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31273095168).

18956214420 is an abundant number, since it is smaller than the sum of its proper divisors (43589975916).

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

18956214420 is a wasteful number, since it uses less digits than its factorization.

18956214420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6750 (or 6748 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The spelling of 18956214420 in words is "eighteen billion, nine hundred fifty-six million, two hundred fourteen thousand, four hundred twenty".