20999940

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{13}}^2\times {\mathrm{19}}^1\times {\mathrm{109}}^1$

素因数の和:166

約数の個数: 144

約数和(自身を含む): 67636800

約数和(自身を除く): 46636860

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 19, 20, 26, 30, 38, 39, 52, 57, 60, 65, 76, 78, 95, 109, 114, 130, 156, 169, 190, 195, 218, 228, 247, 260, 285, 327, 338, 380, 390, 436, 494, 507, 545, 570, 654, 676, 741, 780, 845, 988, 1014, 1090, 1140, 1235, 1308, 1417, 1482, 1635, 1690, 2028, 2071, 2180, 2470, 2535, 2834, 2964, 3211, 3270, 3380, 3705, 4142, 4251, 4940, 5070, 5668, 6213, 6422, 6540, 7085, 7410, 8284, 8502, 9633, 10140, 10355, 12426, 12844, 14170, 14820, 16055, 17004, 18421, 19266, 20710, 21255, 24852, 26923, 28340, 31065, 32110, 36842, 38532, 41420, 42510, 48165, 53846, 55263, 62130, 64220, 73684, 80769, 85020, 92105, 96330, 107692, 110526, 124260, 134615, 161538, 184210, 192660, 221052, 269230, 276315, 323076, 349999, 368420, 403845, 538460, 552630, 699998, 807690, 1049997, 1105260, 1399996, 1615380, 1749995, 2099994, 3499990, 4199988, 5249985, 6999980, 10499970, 20999940]

約数ペア:

[(1, 20999940), (2, 10499970), (3, 6999980), (4, 5249985), (5, 4199988), (6, 3499990), (10, 2099994), (12, 1749995), (13, 1615380), (15, 1399996), (19, 1105260), (20, 1049997), (26, 807690), (30, 699998), (38, 552630), (39, 538460), (52, 403845), (57, 368420), (60, 349999), (65, 323076), (76, 276315), (78, 269230), (95, 221052), (109, 192660), (114, 184210), (130, 161538), (156, 134615), (169, 124260), (190, 110526), (195, 107692), (218, 96330), (228, 92105), (247, 85020), (260, 80769), (285, 73684), (327, 64220), (338, 62130), (380, 55263), (390, 53846), (436, 48165), (494, 42510), (507, 41420), (545, 38532), (570, 36842), (654, 32110), (676, 31065), (741, 28340), (780, 26923), (845, 24852), (988, 21255), (1014, 20710), (1090, 19266), (1140, 18421), (1235, 17004), (1308, 16055), (1417, 14820), (1482, 14170), (1635, 12844), (1690, 12426), (2028, 10355), (2071, 10140), (2180, 9633), (2470, 8502), (2535, 8284), (2834, 7410), (2964, 7085), (3211, 6540), (3270, 6422), (3380, 6213), (3705, 5668), (4142, 5070), (4251, 4940)]