19452707820 has 576 divisors, whose sum is σ = 77012490240. Its totient is φ = 3988528128.

The previous prime is 19452707809. The next prime is 19452707873. The reversal of 19452707820 is 2870725491.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 23635929 + ... + 23636751.

It is an arithmetic number, because the mean of its divisors is an integer number (133702240).

Almost surely, 2^19452707820 is an apocalyptic number.

19452707820 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 19452707820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38506245120).

19452707820 is an abundant number, since it is smaller than the sum of its proper divisors (57559782420).

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

19452707820 is a wasteful number, since it uses less digits than its factorization.

19452707820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911 (or 890 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The spelling of 19452707820 in words is "nineteen billion, four hundred fifty-two million, seven hundred seven thousand, eight hundred twenty".