20658243078 has 224 divisors, whose sum is σ = 53780216832. Its totient is φ = 5889153600.

The previous prime is 20658243077. The next prime is 20658243079. The reversal of 20658243078 is 87034285602.

20658243078 is a `hidden beast` number, since 20 + 6 + 582 + 43 + 0 + 7 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (20658243077) and next prime (20658243079).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20658243077) by changing a digit.

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 111 ways as a sum of consecutive naturals, for example, 18395025 + ... + 18396147.

Almost surely, 2^20658243078 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20658243078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26890108416).

20658243078 is an abundant number, since it is smaller than the sum of its proper divisors (33121973754).

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

20658243078 is a wasteful number, since it uses less digits than its factorization.

20658243078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222 (or 1207 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The spelling of 20658243078 in words is "twenty billion, six hundred fifty-eight million, two hundred forty-three thousand, seventy-eight".