21002940

素因数分解:

$2^2\times 3^2\times 5^1\times 7^1\times {\mathrm{79}}^1\times {\mathrm{211}}^1$

素因数の和:312

約数の個数: 144

約数和(自身を含む): 74081280

約数和(自身を除く): 53078340

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 42, 45, 60, 63, 70, 79, 84, 90, 105, 126, 140, 158, 180, 210, 211, 237, 252, 315, 316, 395, 420, 422, 474, 553, 630, 633, 711, 790, 844, 948, 1055, 1106, 1185, 1260, 1266, 1422, 1477, 1580, 1659, 1899, 2110, 2212, 2370, 2532, 2765, 2844, 2954, 3165, 3318, 3555, 3798, 4220, 4431, 4740, 4977, 5530, 5908, 6330, 6636, 7110, 7385, 7596, 8295, 8862, 9495, 9954, 11060, 12660, 13293, 14220, 14770, 16590, 16669, 17724, 18990, 19908, 22155, 24885, 26586, 29540, 33180, 33338, 37980, 44310, 49770, 50007, 53172, 66465, 66676, 83345, 88620, 99540, 100014, 116683, 132930, 150021, 166690, 200028, 233366, 250035, 265860, 300042, 333380, 350049, 466732, 500070, 583415, 600084, 700098, 750105, 1000140, 1050147, 1166830, 1400196, 1500210, 1750245, 2100294, 2333660, 3000420, 3500490, 4200588, 5250735, 7000980, 10501470, 21002940]

約数ペア:

[(1, 21002940), (2, 10501470), (3, 7000980), (4, 5250735), (5, 4200588), (6, 3500490), (7, 3000420), (9, 2333660), (10, 2100294), (12, 1750245), (14, 1500210), (15, 1400196), (18, 1166830), (20, 1050147), (21, 1000140), (28, 750105), (30, 700098), (35, 600084), (36, 583415), (42, 500070), (45, 466732), (60, 350049), (63, 333380), (70, 300042), (79, 265860), (84, 250035), (90, 233366), (105, 200028), (126, 166690), (140, 150021), (158, 132930), (180, 116683), (210, 100014), (211, 99540), (237, 88620), (252, 83345), (315, 66676), (316, 66465), (395, 53172), (420, 50007), (422, 49770), (474, 44310), (553, 37980), (630, 33338), (633, 33180), (711, 29540), (790, 26586), (844, 24885), (948, 22155), (1055, 19908), (1106, 18990), (1185, 17724), (1260, 16669), (1266, 16590), (1422, 14770), (1477, 14220), (1580, 13293), (1659, 12660), (1899, 11060), (2110, 9954), (2212, 9495), (2370, 8862), (2532, 8295), (2765, 7596), (2844, 7385), (2954, 7110), (3165, 6636), (3318, 6330), (3555, 5908), (3798, 5530), (4220, 4977), (4431, 4740)]