20921940

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{8941}}^1$

素因数の和:8969

約数の個数: 72

約数和(自身を含む): 68352648

約数和(自身を除く): 47430708

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, 90, 117, 130, 156, 180, 195, 234, 260, 390, 468, 585, 780, 1170, 2340, 8941, 17882, 26823, 35764, 44705, 53646, 80469, 89410, 107292, 116233, 134115, 160938, 178820, 232466, 268230, 321876, 348699, 402345, 464932, 536460, 581165, 697398, 804690, 1046097, 1162330, 1394796, 1609380, 1743495, 2092194, 2324660, 3486990, 4184388, 5230485, 6973980, 10460970, 20921940]

約数ペア:

[(1, 20921940), (2, 10460970), (3, 6973980), (4, 5230485), (5, 4184388), (6, 3486990), (9, 2324660), (10, 2092194), (12, 1743495), (13, 1609380), (15, 1394796), (18, 1162330), (20, 1046097), (26, 804690), (30, 697398), (36, 581165), (39, 536460), (45, 464932), (52, 402345), (60, 348699), (65, 321876), (78, 268230), (90, 232466), (117, 178820), (130, 160938), (156, 134115), (180, 116233), (195, 107292), (234, 89410), (260, 80469), (390, 53646), (468, 44705), (585, 35764), (780, 26823), (1170, 17882), (2340, 8941)]