20447478480 has 320 divisors, whose sum is σ = 76875079680. Its totient is φ = 4427827200.

The previous prime is 20447478419. The next prime is 20447478487. The reversal of 20447478480 is 8487474402.

It is a super-2 number, since 2×20447478480² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20447478487) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1054311 + ... + 1073529.

It is an arithmetic number, because the mean of its divisors is an integer number (240234624).

Almost surely, 2^20447478480 is an apocalyptic number.

20447478480 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 20447478480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38437539840).

20447478480 is an abundant number, since it is smaller than the sum of its proper divisors (56427601200).

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

20447478480 is a wasteful number, since it uses less digits than its factorization.

20447478480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19290 (or 19284 counting only the distinct ones).

The product of its (nonzero) digits is 1605632, while the sum is 48.

The spelling of 20447478480 in words is "twenty billion, four hundred forty-seven million, four hundred seventy-eight thousand, four hundred eighty".