81800140

素因数分解:

$2^2\times 5^1\times {\mathrm{109}}^1\times {\mathrm{157}}^1\times {\mathrm{239}}^1$

素因数の和:514

約数の個数: 48

約数和(自身を含む): 175190400

約数和(自身を除く): 93390260

約数列:

[1, 2, 4, 5, 10, 20, 109, 157, 218, 239, 314, 436, 478, 545, 628, 785, 956, 1090, 1195, 1570, 2180, 2390, 3140, 4780, 17113, 26051, 34226, 37523, 52102, 68452, 75046, 85565, 104204, 130255, 150092, 171130, 187615, 260510, 342260, 375230, 521020, 750460, 4090007, 8180014, 16360028, 20450035, 40900070, 81800140]

約数ペア:

[(1, 81800140), (2, 40900070), (4, 20450035), (5, 16360028), (10, 8180014), (20, 4090007), (109, 750460), (157, 521020), (218, 375230), (239, 342260), (314, 260510), (436, 187615), (478, 171130), (545, 150092), (628, 130255), (785, 104204), (956, 85565), (1090, 75046), (1195, 68452), (1570, 52102), (2180, 37523), (2390, 34226), (3140, 26051), (4780, 17113)]