20644882600 has 48 divisors (see below), whose sum is σ = 49296649500. Its totient is φ = 8034762240.

The previous prime is 20644882571. The next prime is 20644882613. The reversal of 20644882600 is 628844602.

It can be written as a sum of positive squares in 6 ways, for example, as 6421457956 + 14223424644 = 80134^2 + 119262^2 .

It is a super-2 number, since 2×20644882600² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1387525 + ... + 1402324.

Almost surely, 2^20644882600 is an apocalyptic number.

20644882600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20644882600 is an abundant number, since it is smaller than the sum of its proper divisors (28651766900).

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

20644882600 is a wasteful number, since it uses less digits than its factorization.

20644882600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2789902 (or 2789893 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 40.

The spelling of 20644882600 in words is "twenty billion, six hundred forty-four million, eight hundred eighty-two thousand, six hundred".