81017780

素因数分解:

$2^2\times 5^1\times {\mathrm{251}}^1\times {\mathrm{16139}}^1$

素因数の和:16399

約数の個数: 24

約数和(自身を含む): 170825760

約数和(自身を除く): 89807980

約数列:

[1, 2, 4, 5, 10, 20, 251, 502, 1004, 1255, 2510, 5020, 16139, 32278, 64556, 80695, 161390, 322780, 4050889, 8101778, 16203556, 20254445, 40508890, 81017780]

約数ペア:

[(1, 81017780), (2, 40508890), (4, 20254445), (5, 16203556), (10, 8101778), (20, 4050889), (251, 322780), (502, 161390), (1004, 80695), (1255, 64556), (2510, 32278), (5020, 16139)]