20746243584 has 560 divisors, whose sum is σ = 70415921664. Its totient is φ = 6046617600.

The previous prime is 20746243579. The next prime is 20746243601. The reversal of 20746243584 is 48534264702.

It is a happy number.

20746243584 is a `hidden beast` number, since 2 + 0 + 7 + 4 + 62 + 4 + 3 + 584 = 666.

It is a super-2 number, since 2×20746243584² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 127277487 + ... + 127277649.

Almost surely, 2^20746243584 is an apocalyptic number.

20746243584 is a gapful number since it is divisible by the number (24) 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 20746243584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35207960832).

20746243584 is an abundant number, since it is smaller than the sum of its proper divisors (49669678080).

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

20746243584 is an equidigital number, since it uses as much as digits as its factorization.

20746243584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 45.

The spelling of 20746243584 in words is "twenty billion, seven hundred forty-six million, two hundred forty-three thousand, five hundred eighty-four".