20898080

素因数分解:

$2^5\times 5^1\times 7^1\times {\mathrm{47}}^1\times {\mathrm{397}}^1$

素因数の和:466

約数の個数: 96

約数和(自身を含む): 57770496

約数和(自身を除く): 36872416

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 47, 56, 70, 80, 94, 112, 140, 160, 188, 224, 235, 280, 329, 376, 397, 470, 560, 658, 752, 794, 940, 1120, 1316, 1504, 1588, 1645, 1880, 1985, 2632, 2779, 3176, 3290, 3760, 3970, 5264, 5558, 6352, 6580, 7520, 7940, 10528, 11116, 12704, 13160, 13895, 15880, 18659, 22232, 26320, 27790, 31760, 37318, 44464, 52640, 55580, 63520, 74636, 88928, 93295, 111160, 130613, 149272, 186590, 222320, 261226, 298544, 373180, 444640, 522452, 597088, 653065, 746360, 1044904, 1306130, 1492720, 2089808, 2612260, 2985440, 4179616, 5224520, 10449040, 20898080]

約数ペア:

[(1, 20898080), (2, 10449040), (4, 5224520), (5, 4179616), (7, 2985440), (8, 2612260), (10, 2089808), (14, 1492720), (16, 1306130), (20, 1044904), (28, 746360), (32, 653065), (35, 597088), (40, 522452), (47, 444640), (56, 373180), (70, 298544), (80, 261226), (94, 222320), (112, 186590), (140, 149272), (160, 130613), (188, 111160), (224, 93295), (235, 88928), (280, 74636), (329, 63520), (376, 55580), (397, 52640), (470, 44464), (560, 37318), (658, 31760), (752, 27790), (794, 26320), (940, 22232), (1120, 18659), (1316, 15880), (1504, 13895), (1588, 13160), (1645, 12704), (1880, 11116), (1985, 10528), (2632, 7940), (2779, 7520), (3176, 6580), (3290, 6352), (3760, 5558), (3970, 5264)]