20363206578 has 64 divisors (see below), whose sum is σ = 47889902592. Its totient is φ = 5690825280.

The previous prime is 20363206517. The next prime is 20363206579. The reversal of 20363206578 is 87560236302.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20363206579) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 987651 + ... + 1008057.

It is an arithmetic number, because the mean of its divisors is an integer number (748279728).

Almost surely, 2^20363206578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20363206578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23944951296).

20363206578 is an abundant number, since it is smaller than the sum of its proper divisors (27526696014).

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

20363206578 is a wasteful number, since it uses less digits than its factorization.

20363206578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21599.

The product of its (nonzero) digits is 362880, while the sum is 42.

The spelling of 20363206578 in words is "twenty billion, three hundred sixty-three million, two hundred six thousand, five hundred seventy-eight".