21450780

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{89}}^1\times {\mathrm{103}}^1$

素因数の和:220

約数の個数: 144

約数和(自身を含む): 71547840

約数和(自身を除く): 50097060

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 13, 15, 18, 20, 26, 30, 36, 39, 45, 52, 60, 65, 78, 89, 90, 103, 117, 130, 156, 178, 180, 195, 206, 234, 260, 267, 309, 356, 390, 412, 445, 468, 515, 534, 585, 618, 780, 801, 890, 927, 1030, 1068, 1157, 1170, 1236, 1335, 1339, 1545, 1602, 1780, 1854, 2060, 2314, 2340, 2670, 2678, 3090, 3204, 3471, 3708, 4005, 4017, 4628, 4635, 5340, 5356, 5785, 6180, 6695, 6942, 8010, 8034, 9167, 9270, 10413, 11570, 12051, 13390, 13884, 16020, 16068, 17355, 18334, 18540, 20085, 20826, 23140, 24102, 26780, 27501, 34710, 36668, 40170, 41652, 45835, 48204, 52065, 55002, 60255, 69420, 80340, 82503, 91670, 104130, 110004, 119171, 120510, 137505, 165006, 183340, 208260, 238342, 241020, 275010, 330012, 357513, 412515, 476684, 550020, 595855, 715026, 825030, 1072539, 1191710, 1430052, 1650060, 1787565, 2145078, 2383420, 3575130, 4290156, 5362695, 7150260, 10725390, 21450780]

約数ペア:

[(1, 21450780), (2, 10725390), (3, 7150260), (4, 5362695), (5, 4290156), (6, 3575130), (9, 2383420), (10, 2145078), (12, 1787565), (13, 1650060), (15, 1430052), (18, 1191710), (20, 1072539), (26, 825030), (30, 715026), (36, 595855), (39, 550020), (45, 476684), (52, 412515), (60, 357513), (65, 330012), (78, 275010), (89, 241020), (90, 238342), (103, 208260), (117, 183340), (130, 165006), (156, 137505), (178, 120510), (180, 119171), (195, 110004), (206, 104130), (234, 91670), (260, 82503), (267, 80340), (309, 69420), (356, 60255), (390, 55002), (412, 52065), (445, 48204), (468, 45835), (515, 41652), (534, 40170), (585, 36668), (618, 34710), (780, 27501), (801, 26780), (890, 24102), (927, 23140), (1030, 20826), (1068, 20085), (1157, 18540), (1170, 18334), (1236, 17355), (1335, 16068), (1339, 16020), (1545, 13884), (1602, 13390), (1780, 12051), (1854, 11570), (2060, 10413), (2314, 9270), (2340, 9167), (2670, 8034), (2678, 8010), (3090, 6942), (3204, 6695), (3471, 6180), (3708, 5785), (4005, 5356), (4017, 5340), (4628, 4635)]