19952033640 has 576 divisors, whose sum is σ = 79254806400. Its totient is φ = 3998776320.

The previous prime is 19952033609. The next prime is 19952033641. The reversal of 19952033640 is 4633025991.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 19952033592 and 19952033601.

It is not an unprimeable number, because it can be changed into a prime (19952033641) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 20632437 + ... + 20633403.

It is an arithmetic number, because the mean of its divisors is an integer number (137595150).

Almost surely, 2^19952033640 is an apocalyptic number.

19952033640 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 19952033640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39627403200).

19952033640 is an abundant number, since it is smaller than the sum of its proper divisors (59302772760).

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

19952033640 is a wasteful number, since it uses less digits than its factorization.

19952033640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046 (or 1024 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 42.

The spelling of 19952033640 in words is "nineteen billion, nine hundred fifty-two million, thirty-three thousand, six hundred forty".