20623636800 has 420 divisors, whose sum is σ = 81645301276. Its totient is φ = 5076172800.

The previous prime is 20623636799. The next prime is 20623636837. The reversal of 20623636800 is 863632602.

20623636800 is a `hidden beast` number, since 20 + 623 + 6 + 3 + 6 + 8 + 0 + 0 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 4143239424 + 16480397376 = 64368^2 + 128376^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1678680 + ... + 1690920.

Almost surely, 2^20623636800 is an apocalyptic number.

20623636800 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 20623636800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40822650638).

20623636800 is an abundant number, since it is smaller than the sum of its proper divisors (61021664476).

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

20623636800 is a wasteful number, since it uses less digits than its factorization.

20623636800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12288 (or 12264 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The spelling of 20623636800 in words is "twenty billion, six hundred twenty-three million, six hundred thirty-six thousand, eight hundred".