20563238520 has 144 divisors (see below), whose sum is σ = 73458501480. Its totient is φ = 4985016960.

The previous prime is 20563238519. The next prime is 20563238533. The reversal of 20563238520 is 2583236502.

20563238520 is a `hidden beast` number, since 20 + 56 + 32 + 38 + 520 = 666.

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

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 192474 + ... + 279593.

Almost surely, 2^20563238520 is an apocalyptic number.

20563238520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20563238520 is an abundant number, since it is smaller than the sum of its proper divisors (52895262960).

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

20563238520 is a wasteful number, since it uses less digits than its factorization.

20563238520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472106 (or 472088 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 20563238520 in words is "twenty billion, five hundred sixty-three million, two hundred thirty-eight thousand, five hundred twenty".