20472857280 has 168 divisors, whose sum is σ = 72056164752. Its totient is φ = 5332432896.

The previous prime is 20472857239. The next prime is 20472857297. The reversal of 20472857280 is 8275827402.

20472857280 is a `hidden beast` number, since 2 + 0 + 4 + 72 + 8 + 572 + 8 + 0 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41182 + ... + 206498.

Almost surely, 2^20472857280 is an apocalyptic number.

20472857280 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 20472857280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36028082376).

20472857280 is an abundant number, since it is smaller than the sum of its proper divisors (51583307472).

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

20472857280 is a wasteful number, since it uses less digits than its factorization.

20472857280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165383 (or 165370 counting only the distinct ones).

The product of its (nonzero) digits is 501760, while the sum is 45.

The spelling of 20472857280 in words is "twenty billion, four hundred seventy-two million, eight hundred fifty-seven thousand, two hundred eighty".