20747144073656 has 384 divisors, whose sum is σ = 53856698757120. Its totient is φ = 7364649600000.

The previous prime is 20747144073637. The next prime is 20747144073671. The reversal of 20747144073656 is 65637044174702.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1874002601 + ... + 1874013671.

It is an arithmetic number, because the mean of its divisors is an integer number (140251819680).

Almost surely, 2^{20747144073656} is an apocalyptic number.

20747144073656 is a gapful number since it is divisible by the number (26) 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 20747144073656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26928349378560).

20747144073656 is an abundant number, since it is smaller than the sum of its proper divisors (33109554683464).

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

20747144073656 is a wasteful number, since it uses less digits than its factorization.

20747144073656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11547 (or 11536 counting only the distinct ones).

The product of its (nonzero) digits is 23708160, while the sum is 56.

The spelling of 20747144073656 in words is "twenty trillion, seven hundred forty-seven billion, one hundred forty-four million, seventy-three thousand, six hundred fifty-six".