19959940

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{997}}^1$

素因数の和:1037

約数の個数: 96

約数和(自身を含む): 56335104

約数和(自身を除く): 36375164

約数列:

[1, 2, 4, 5, 7, 10, 11, 13, 14, 20, 22, 26, 28, 35, 44, 52, 55, 65, 70, 77, 91, 110, 130, 140, 143, 154, 182, 220, 260, 286, 308, 364, 385, 455, 572, 715, 770, 910, 997, 1001, 1430, 1540, 1820, 1994, 2002, 2860, 3988, 4004, 4985, 5005, 6979, 9970, 10010, 10967, 12961, 13958, 19940, 20020, 21934, 25922, 27916, 34895, 43868, 51844, 54835, 64805, 69790, 76769, 90727, 109670, 129610, 139580, 142571, 153538, 181454, 219340, 259220, 285142, 307076, 362908, 383845, 453635, 570284, 712855, 767690, 907270, 997997, 1425710, 1535380, 1814540, 1995994, 2851420, 3991988, 4989985, 9979970, 19959940]

約数ペア:

[(1, 19959940), (2, 9979970), (4, 4989985), (5, 3991988), (7, 2851420), (10, 1995994), (11, 1814540), (13, 1535380), (14, 1425710), (20, 997997), (22, 907270), (26, 767690), (28, 712855), (35, 570284), (44, 453635), (52, 383845), (55, 362908), (65, 307076), (70, 285142), (77, 259220), (91, 219340), (110, 181454), (130, 153538), (140, 142571), (143, 139580), (154, 129610), (182, 109670), (220, 90727), (260, 76769), (286, 69790), (308, 64805), (364, 54835), (385, 51844), (455, 43868), (572, 34895), (715, 27916), (770, 25922), (910, 21934), (997, 20020), (1001, 19940), (1430, 13958), (1540, 12961), (1820, 10967), (1994, 10010), (2002, 9970), (2860, 6979), (3988, 5005), (4004, 4985)]