20784880

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^2\times {\mathrm{29}}^1\times {\mathrm{31}}^1$

素因数の和:107

約数の個数: 120

約数和(自身を含む): 54817920

約数和(自身を除く): 34033040

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 29, 31, 34, 40, 58, 62, 68, 80, 85, 116, 124, 136, 145, 155, 170, 232, 248, 272, 289, 290, 310, 340, 464, 493, 496, 527, 578, 580, 620, 680, 899, 986, 1054, 1156, 1160, 1240, 1360, 1445, 1798, 1972, 2108, 2312, 2320, 2465, 2480, 2635, 2890, 3596, 3944, 4216, 4495, 4624, 4930, 5270, 5780, 7192, 7888, 8381, 8432, 8959, 8990, 9860, 10540, 11560, 14384, 15283, 16762, 17918, 17980, 19720, 21080, 23120, 30566, 33524, 35836, 35960, 39440, 41905, 42160, 44795, 61132, 67048, 71672, 71920, 76415, 83810, 89590, 122264, 134096, 143344, 152830, 167620, 179180, 244528, 259811, 305660, 335240, 358360, 519622, 611320, 670480, 716720, 1039244, 1222640, 1299055, 2078488, 2598110, 4156976, 5196220, 10392440, 20784880]

約数ペア:

[(1, 20784880), (2, 10392440), (4, 5196220), (5, 4156976), (8, 2598110), (10, 2078488), (16, 1299055), (17, 1222640), (20, 1039244), (29, 716720), (31, 670480), (34, 611320), (40, 519622), (58, 358360), (62, 335240), (68, 305660), (80, 259811), (85, 244528), (116, 179180), (124, 167620), (136, 152830), (145, 143344), (155, 134096), (170, 122264), (232, 89590), (248, 83810), (272, 76415), (289, 71920), (290, 71672), (310, 67048), (340, 61132), (464, 44795), (493, 42160), (496, 41905), (527, 39440), (578, 35960), (580, 35836), (620, 33524), (680, 30566), (899, 23120), (986, 21080), (1054, 19720), (1156, 17980), (1160, 17918), (1240, 16762), (1360, 15283), (1445, 14384), (1798, 11560), (1972, 10540), (2108, 9860), (2312, 8990), (2320, 8959), (2465, 8432), (2480, 8381), (2635, 7888), (2890, 7192), (3596, 5780), (3944, 5270), (4216, 4930), (4495, 4624)]