20138563368 has 144 divisors (see below), whose sum is σ = 68515705440. Its totient is φ = 5230779840.

The previous prime is 20138563339. The next prime is 20138563427. The reversal of 20138563368 is 86336583102.

20138563368 is a `hidden beast` number, since 2 + 0 + 1 + 3 + 8 + 5 + 633 + 6 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 104130 + ... + 226097.

It is an arithmetic number, because the mean of its divisors is an integer number (475803510).

Almost surely, 2^20138563368 is an apocalyptic number.

20138563368 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20138563368 is an abundant number, since it is smaller than the sum of its proper divisors (48377142072).

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

20138563368 is a wasteful number, since it uses less digits than its factorization.

20138563368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330268 (or 330250 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 20138563368 in words is "twenty billion, one hundred thirty-eight million, five hundred sixty-three thousand, three hundred sixty-eight".