20403543600 has 420 divisors, whose sum is σ = 80189676312. Its totient is φ = 4945536000.

The previous prime is 20403543533. The next prime is 20403543653. The reversal of 20403543600 is 634530402.

20403543600 is a `hidden beast` number, since 2 + 0 + 4 + 0 + 3 + 54 + 3 + 600 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 3204420 + ... + 3210780.

Almost surely, 2^20403543600 is an apocalyptic number.

20403543600 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 20403543600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40094838156).

20403543600 is an abundant number, since it is smaller than the sum of its proper divisors (59786132712).

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

20403543600 is a wasteful number, since it uses less digits than its factorization.

20403543600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6408 (or 6382 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

The spelling of 20403543600 in words is "twenty billion, four hundred three million, five hundred forty-three thousand, six hundred".