21156720

素因数分解:

$2^4\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{6781}}^1$

素因数の和:6810

約数の個数: 80

約数和(自身を含む): 70641312

約数和(自身を除く): 49484592

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 13, 15, 16, 20, 24, 26, 30, 39, 40, 48, 52, 60, 65, 78, 80, 104, 120, 130, 156, 195, 208, 240, 260, 312, 390, 520, 624, 780, 1040, 1560, 3120, 6781, 13562, 20343, 27124, 33905, 40686, 54248, 67810, 81372, 88153, 101715, 108496, 135620, 162744, 176306, 203430, 264459, 271240, 325488, 352612, 406860, 440765, 528918, 542480, 705224, 813720, 881530, 1057836, 1322295, 1410448, 1627440, 1763060, 2115672, 2644590, 3526120, 4231344, 5289180, 7052240, 10578360, 21156720]

約数ペア:

[(1, 21156720), (2, 10578360), (3, 7052240), (4, 5289180), (5, 4231344), (6, 3526120), (8, 2644590), (10, 2115672), (12, 1763060), (13, 1627440), (15, 1410448), (16, 1322295), (20, 1057836), (24, 881530), (26, 813720), (30, 705224), (39, 542480), (40, 528918), (48, 440765), (52, 406860), (60, 352612), (65, 325488), (78, 271240), (80, 264459), (104, 203430), (120, 176306), (130, 162744), (156, 135620), (195, 108496), (208, 101715), (240, 88153), (260, 81372), (312, 67810), (390, 54248), (520, 40686), (624, 33905), (780, 27124), (1040, 20343), (1560, 13562), (3120, 6781)]