20446555500 has 576 divisors, whose sum is σ = 78498201600. Its totient is φ = 4376332800.

The previous prime is 20446555499. The next prime is 20446555511. The reversal of 20446555500 is 555564402.

20446555500 is a `hidden beast` number, since 2 + 0 + 44 + 65 + 5 + 550 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 76009366 + ... + 76009634.

It is an arithmetic number, because the mean of its divisors is an integer number (136281600).

Almost surely, 2^20446555500 is an apocalyptic number.

20446555500 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 20446555500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39249100800).

20446555500 is an abundant number, since it is smaller than the sum of its proper divisors (58051646100).

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

20446555500 is a wasteful number, since it uses less digits than its factorization.

20446555500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447 (or 432 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 36.

The spelling of 20446555500 in words is "twenty billion, four hundred forty-six million, five hundred fifty-five thousand, five hundred".