20172489480 has 768 divisors, whose sum is σ = 83479818240. Its totient is φ = 4311014400.

The previous prime is 20172489479. The next prime is 20172489481. The reversal of 20172489480 is 8498427102.

20172489480 is a `hidden beast` number, since 20 + 1 + 72 + 4 + 89 + 480 = 666.

It is an interprime number because it is at equal distance from previous prime (20172489479) and next prime (20172489481).

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

It is not an unprimeable number, because it can be changed into a prime (20172489481) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 31968765 + ... + 31969395.

It is an arithmetic number, because the mean of its divisors is an integer number (108697680).

Almost surely, 2^20172489480 is an apocalyptic number.

20172489480 is a gapful number since it is divisible by the number (20) 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 20172489480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41739909120).

20172489480 is an abundant number, since it is smaller than the sum of its proper divisors (63307328760).

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

20172489480 is a wasteful number, since it uses less digits than its factorization.

20172489480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704 (or 688 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The spelling of 20172489480 in words is "twenty billion, one hundred seventy-two million, four hundred eighty-nine thousand, four hundred eighty".