19805454560 has 48 divisors (see below), whose sum is σ = 48824760096. Its totient is φ = 7577737728.

The previous prime is 19805454551. The next prime is 19805454569. The reversal of 19805454560 is 6545450891.

It is an interprime number because it is at equal distance from previous prime (19805454551) and next prime (19805454569).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19805454569) 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, 2687279 + ... + 2694638.

It is an arithmetic number, because the mean of its divisors is an integer number (1017182502).

Almost surely, 2^19805454560 is an apocalyptic number.

19805454560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19805454560 is an abundant number, since it is smaller than the sum of its proper divisors (29019305536).

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

19805454560 is a wasteful number, since it uses less digits than its factorization.

19805454560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5381955 (or 5381947 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 47.

The spelling of 19805454560 in words is "nineteen billion, eight hundred five million, four hundred fifty-four thousand, five hundred sixty".