19906620552 has 192 divisors, whose sum is σ = 67899511680. Its totient is φ = 5127929856.

The previous prime is 19906620551. The next prime is 19906620557. The reversal of 19906620552 is 25502660991.

It is a happy number.

19906620552 is a `hidden beast` number, since 1 + 9 + 90 + 6 + 6 + 2 + 0 + 552 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 19906620498 and 19906620507.

It is not an unprimeable number, because it can be changed into a prime (19906620551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 246408 + ... + 317064.

It is an arithmetic number, because the mean of its divisors is an integer number (353643290).

Almost surely, 2^19906620552 is an apocalyptic number.

19906620552 is a gapful number since it is divisible by the number (12) 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 19906620552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33949755840).

19906620552 is an abundant number, since it is smaller than the sum of its proper divisors (47992891128).

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

19906620552 is a wasteful number, since it uses less digits than its factorization.

19906620552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70732 (or 70725 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The spelling of 19906620552 in words is "nineteen billion, nine hundred six million, six hundred twenty thousand, five hundred fifty-two".