20859280

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{647}}^1$

素因数の和:704

約数の個数: 80

約数和(自身を含む): 53996544

約数和(自身を除く): 33137264

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 31, 40, 52, 62, 65, 80, 104, 124, 130, 155, 208, 248, 260, 310, 403, 496, 520, 620, 647, 806, 1040, 1240, 1294, 1612, 2015, 2480, 2588, 3224, 3235, 4030, 5176, 6448, 6470, 8060, 8411, 10352, 12940, 16120, 16822, 20057, 25880, 32240, 33644, 40114, 42055, 51760, 67288, 80228, 84110, 100285, 134576, 160456, 168220, 200570, 260741, 320912, 336440, 401140, 521482, 672880, 802280, 1042964, 1303705, 1604560, 2085928, 2607410, 4171856, 5214820, 10429640, 20859280]

約数ペア:

[(1, 20859280), (2, 10429640), (4, 5214820), (5, 4171856), (8, 2607410), (10, 2085928), (13, 1604560), (16, 1303705), (20, 1042964), (26, 802280), (31, 672880), (40, 521482), (52, 401140), (62, 336440), (65, 320912), (80, 260741), (104, 200570), (124, 168220), (130, 160456), (155, 134576), (208, 100285), (248, 84110), (260, 80228), (310, 67288), (403, 51760), (496, 42055), (520, 40114), (620, 33644), (647, 32240), (806, 25880), (1040, 20057), (1240, 16822), (1294, 16120), (1612, 12940), (2015, 10352), (2480, 8411), (2588, 8060), (3224, 6470), (3235, 6448), (4030, 5176)]