19456555020 has 144 divisors (see below), whose sum is σ = 62599665408. Its totient is φ = 4423144320.

The previous prime is 19456554991. The next prime is 19456555037. The reversal of 19456555020 is 2055565491.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23990415 + ... + 23991225.

Almost surely, 2^19456555020 is an apocalyptic number.

19456555020 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 19456555020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31299832704).

19456555020 is an abundant number, since it is smaller than the sum of its proper divisors (43143110388).

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

19456555020 is a wasteful number, since it uses less digits than its factorization.

19456555020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308 (or 1067 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 42.

The spelling of 19456555020 in words is "nineteen billion, four hundred fifty-six million, five hundred fifty-five thousand, twenty".