18620448920 has 32 divisors (see below), whose sum is σ = 41934093120. Its totient is φ = 7441409280.

The previous prime is 18620448907. The next prime is 18620448923. The reversal of 18620448920 is 2984402681.

It is a super-2 number, since 2×18620448920² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18620448923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166901 + ... + 255140.

It is an arithmetic number, because the mean of its divisors is an integer number (1310440410).

Almost surely, 2^18620448920 is an apocalyptic number.

18620448920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18620448920 is an abundant number, since it is smaller than the sum of its proper divisors (23313644200).

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

18620448920 is a wasteful number, since it uses less digits than its factorization.

18620448920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423155 (or 423151 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 44.

The spelling of 18620448920 in words is "eighteen billion, six hundred twenty million, four hundred forty-eight thousand, nine hundred twenty".