20563673800 has 48 divisors (see below), whose sum is σ = 49459194900. Its totient is φ = 7941830400.

The previous prime is 20563673759. The next prime is 20563673803. The reversal of 20563673800 is 837636502.

It can be written as a sum of positive squares in 6 ways, for example, as 9947668644 + 10616005156 = 99738^2 + 103034^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20563673803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1766931 + ... + 1778530.

Almost surely, 2^20563673800 is an apocalyptic number.

20563673800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20563673800 is an abundant number, since it is smaller than the sum of its proper divisors (28895521100).

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

20563673800 is a wasteful number, since it uses less digits than its factorization.

20563673800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3545506 (or 3545497 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 40.

The spelling of 20563673800 in words is "twenty billion, five hundred sixty-three million, six hundred seventy-three thousand, eight hundred".