20634786720 has 384 divisors, whose sum is σ = 76174318080. Its totient is φ = 5206671360.

The previous prime is 20634786713. The next prime is 20634786727. The reversal of 20634786720 is 2768743602.

20634786720 is a `hidden beast` number, since 2 + 0 + 634 + 7 + 8 + 6 + 7 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (20634786713) and next prime (20634786727).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (20634786727) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9636850 + ... + 9638990.

It is an arithmetic number, because the mean of its divisors is an integer number (198370620).

Almost surely, 2^20634786720 is an apocalyptic number.

20634786720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20634786720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38087159040).

20634786720 is an abundant number, since it is smaller than the sum of its proper divisors (55539531360).

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

20634786720 is a wasteful number, since it uses less digits than its factorization.

20634786720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285 (or 2271 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The spelling of 20634786720 in words is "twenty billion, six hundred thirty-four million, seven hundred eighty-six thousand, seven hundred twenty".