21388040

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{71}}^1\times {\mathrm{443}}^1$

素因数の和:542

約数の個数: 64

約数和(自身を含む): 51788160

約数和(自身を除く): 30400120

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 71, 85, 136, 142, 170, 284, 340, 355, 443, 568, 680, 710, 886, 1207, 1420, 1772, 2215, 2414, 2840, 3544, 4430, 4828, 6035, 7531, 8860, 9656, 12070, 15062, 17720, 24140, 30124, 31453, 37655, 48280, 60248, 62906, 75310, 125812, 150620, 157265, 251624, 301240, 314530, 534701, 629060, 1069402, 1258120, 2138804, 2673505, 4277608, 5347010, 10694020, 21388040]

約数ペア:

[(1, 21388040), (2, 10694020), (4, 5347010), (5, 4277608), (8, 2673505), (10, 2138804), (17, 1258120), (20, 1069402), (34, 629060), (40, 534701), (68, 314530), (71, 301240), (85, 251624), (136, 157265), (142, 150620), (170, 125812), (284, 75310), (340, 62906), (355, 60248), (443, 48280), (568, 37655), (680, 31453), (710, 30124), (886, 24140), (1207, 17720), (1420, 15062), (1772, 12070), (2215, 9656), (2414, 8860), (2840, 7531), (3544, 6035), (4430, 4828)]