18420691520 has 672 divisors, whose sum is σ = 59996832000. Its totient is φ = 5364817920.

The previous prime is 18420691517. The next prime is 18420691571. The reversal of 18420691520 is 2519602481.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 252338204 + ... + 252338276.

It is an arithmetic number, because the mean of its divisors is an integer number (89281000).

Almost surely, 2^18420691520 is an apocalyptic number.

18420691520 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 18420691520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29998416000).

18420691520 is an abundant number, since it is smaller than the sum of its proper divisors (41576140480).

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

18420691520 is a wasteful number, since it uses less digits than its factorization.

18420691520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The spelling of 18420691520 in words is "eighteen billion, four hundred twenty million, six hundred ninety-one thousand, five hundred twenty".