20293232778 has 224 divisors, whose sum is σ = 57493408896. Its totient is φ = 5226125184.

The previous prime is 20293232761. The next prime is 20293232779. The reversal of 20293232778 is 87723239202.

It is not an unprimeable number, because it can be changed into a prime (20293232779) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 5703376 + ... + 5706932.

It is an arithmetic number, because the mean of its divisors is an integer number (256667004).

Almost surely, 2^20293232778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20293232778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28746704448).

20293232778 is an abundant number, since it is smaller than the sum of its proper divisors (37200176118).

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

20293232778 is a wasteful number, since it uses less digits than its factorization.

20293232778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3640 (or 3625 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 45.

The spelling of 20293232778 in words is "twenty billion, two hundred ninety-three million, two hundred thirty-two thousand, seven hundred seventy-eight".