20905240

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{71}}^1\times {\mathrm{433}}^1$

素因数の和:532

約数の個数: 64

約数和(自身を含む): 50621760

約数和(自身を除く): 29716520

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 71, 85, 136, 142, 170, 284, 340, 355, 433, 568, 680, 710, 866, 1207, 1420, 1732, 2165, 2414, 2840, 3464, 4330, 4828, 6035, 7361, 8660, 9656, 12070, 14722, 17320, 24140, 29444, 30743, 36805, 48280, 58888, 61486, 73610, 122972, 147220, 153715, 245944, 294440, 307430, 522631, 614860, 1045262, 1229720, 2090524, 2613155, 4181048, 5226310, 10452620, 20905240]

約数ペア:

[(1, 20905240), (2, 10452620), (4, 5226310), (5, 4181048), (8, 2613155), (10, 2090524), (17, 1229720), (20, 1045262), (34, 614860), (40, 522631), (68, 307430), (71, 294440), (85, 245944), (136, 153715), (142, 147220), (170, 122972), (284, 73610), (340, 61486), (355, 58888), (433, 48280), (568, 36805), (680, 30743), (710, 29444), (866, 24140), (1207, 17320), (1420, 14722), (1732, 12070), (2165, 9656), (2414, 8660), (2840, 7361), (3464, 6035), (4330, 4828)]