20980820

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{79}}^1\times {\mathrm{271}}^1$

素因数の和:373

約数の個数: 72

約数和(自身を含む): 52093440

約数和(自身を除く): 31112620

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 79, 98, 140, 158, 196, 245, 271, 316, 395, 490, 542, 553, 790, 980, 1084, 1106, 1355, 1580, 1897, 2212, 2710, 2765, 3794, 3871, 5420, 5530, 7588, 7742, 9485, 11060, 13279, 15484, 18970, 19355, 21409, 26558, 37940, 38710, 42818, 53116, 66395, 77420, 85636, 107045, 132790, 149863, 214090, 265580, 299726, 428180, 599452, 749315, 1049041, 1498630, 2098082, 2997260, 4196164, 5245205, 10490410, 20980820]

約数ペア:

[(1, 20980820), (2, 10490410), (4, 5245205), (5, 4196164), (7, 2997260), (10, 2098082), (14, 1498630), (20, 1049041), (28, 749315), (35, 599452), (49, 428180), (70, 299726), (79, 265580), (98, 214090), (140, 149863), (158, 132790), (196, 107045), (245, 85636), (271, 77420), (316, 66395), (395, 53116), (490, 42818), (542, 38710), (553, 37940), (790, 26558), (980, 21409), (1084, 19355), (1106, 18970), (1355, 15484), (1580, 13279), (1897, 11060), (2212, 9485), (2710, 7742), (2765, 7588), (3794, 5530), (3871, 5420)]