21371720

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{593}}^1$

素因数の和:674

約数の個数: 64

約数和(自身を含む): 51963120

約数和(自身を除く): 30591400

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 53, 68, 85, 106, 136, 170, 212, 265, 340, 424, 530, 593, 680, 901, 1060, 1186, 1802, 2120, 2372, 2965, 3604, 4505, 4744, 5930, 7208, 9010, 10081, 11860, 18020, 20162, 23720, 31429, 36040, 40324, 50405, 62858, 80648, 100810, 125716, 157145, 201620, 251432, 314290, 403240, 534293, 628580, 1068586, 1257160, 2137172, 2671465, 4274344, 5342930, 10685860, 21371720]

約数ペア:

[(1, 21371720), (2, 10685860), (4, 5342930), (5, 4274344), (8, 2671465), (10, 2137172), (17, 1257160), (20, 1068586), (34, 628580), (40, 534293), (53, 403240), (68, 314290), (85, 251432), (106, 201620), (136, 157145), (170, 125716), (212, 100810), (265, 80648), (340, 62858), (424, 50405), (530, 40324), (593, 36040), (680, 31429), (901, 23720), (1060, 20162), (1186, 18020), (1802, 11860), (2120, 10081), (2372, 9010), (2965, 7208), (3604, 5930), (4505, 4744)]