257895820

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{653}}^1$

素因数の和:720

約数の個数: 144

約数和(自身を含む): 701422848

約数和(自身を除く): 443527028

約数列:

[1, 2, 4, 5, 7, 10, 13, 14, 20, 26, 28, 31, 35, 49, 52, 62, 65, 70, 91, 98, 124, 130, 140, 155, 182, 196, 217, 245, 260, 310, 364, 403, 434, 455, 490, 620, 637, 653, 806, 868, 910, 980, 1085, 1274, 1306, 1519, 1612, 1820, 2015, 2170, 2548, 2612, 2821, 3038, 3185, 3265, 4030, 4340, 4571, 5642, 6076, 6370, 6530, 7595, 8060, 8489, 9142, 11284, 12740, 13060, 14105, 15190, 16978, 18284, 19747, 20243, 22855, 28210, 30380, 31997, 33956, 39494, 40486, 42445, 45710, 56420, 59423, 63994, 78988, 80972, 84890, 91420, 98735, 101215, 118846, 127988, 141701, 159985, 169780, 197470, 202430, 237692, 263159, 283402, 297115, 319970, 394940, 404860, 415961, 526318, 566804, 594230, 639940, 708505, 831922, 991907, 1052636, 1188460, 1315795, 1417010, 1663844, 1842113, 1983814, 2079805, 2631590, 2834020, 3684226, 3967628, 4159610, 4959535, 5263180, 7368452, 8319220, 9210565, 9919070, 12894791, 18421130, 19838140, 25789582, 36842260, 51579164, 64473955, 128947910, 257895820]

約数ペア:

[(1, 257895820), (2, 128947910), (4, 64473955), (5, 51579164), (7, 36842260), (10, 25789582), (13, 19838140), (14, 18421130), (20, 12894791), (26, 9919070), (28, 9210565), (31, 8319220), (35, 7368452), (49, 5263180), (52, 4959535), (62, 4159610), (65, 3967628), (70, 3684226), (91, 2834020), (98, 2631590), (124, 2079805), (130, 1983814), (140, 1842113), (155, 1663844), (182, 1417010), (196, 1315795), (217, 1188460), (245, 1052636), (260, 991907), (310, 831922), (364, 708505), (403, 639940), (434, 594230), (455, 566804), (490, 526318), (620, 415961), (637, 404860), (653, 394940), (806, 319970), (868, 297115), (910, 283402), (980, 263159), (1085, 237692), (1274, 202430), (1306, 197470), (1519, 169780), (1612, 159985), (1820, 141701), (2015, 127988), (2170, 118846), (2548, 101215), (2612, 98735), (2821, 91420), (3038, 84890), (3185, 80972), (3265, 78988), (4030, 63994), (4340, 59423), (4571, 56420), (5642, 45710), (6076, 42445), (6370, 40486), (6530, 39494), (7595, 33956), (8060, 31997), (8489, 30380), (9142, 28210), (11284, 22855), (12740, 20243), (13060, 19747), (14105, 18284), (15190, 16978)]