20455649280 has 1040 divisors, whose sum is σ = 85631990400. Its totient is φ = 4618321920.

The previous prime is 20455649273. The next prime is 20455649317. The reversal of 20455649280 is 8294655402.

20455649280 is a `hidden beast` number, since 2 + 0 + 4 + 5 + 564 + 9 + 2 + 80 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 346705891 + ... + 346705949.

Almost surely, 2^20455649280 is an apocalyptic number.

20455649280 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 20455649280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42815995200).

20455649280 is an abundant number, since it is smaller than the sum of its proper divisors (65176341120).

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

20455649280 is a wasteful number, since it uses less digits than its factorization.

20455649280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 99 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 20455649280 in words is "twenty billion, four hundred fifty-five million, six hundred forty-nine thousand, two hundred eighty".