21164320

素因数分解:

$2^5\times 5^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{251}}^1$

素因数の和:314

約数の個数: 96

約数和(自身を含む): 54867456

約数和(自身を除く): 33703136

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 31, 32, 34, 40, 62, 68, 80, 85, 124, 136, 155, 160, 170, 248, 251, 272, 310, 340, 496, 502, 527, 544, 620, 680, 992, 1004, 1054, 1240, 1255, 1360, 2008, 2108, 2480, 2510, 2635, 2720, 4016, 4216, 4267, 4960, 5020, 5270, 7781, 8032, 8432, 8534, 10040, 10540, 15562, 16864, 17068, 20080, 21080, 21335, 31124, 34136, 38905, 40160, 42160, 42670, 62248, 68272, 77810, 84320, 85340, 124496, 132277, 136544, 155620, 170680, 248992, 264554, 311240, 341360, 529108, 622480, 661385, 682720, 1058216, 1244960, 1322770, 2116432, 2645540, 4232864, 5291080, 10582160, 21164320]

約数ペア:

[(1, 21164320), (2, 10582160), (4, 5291080), (5, 4232864), (8, 2645540), (10, 2116432), (16, 1322770), (17, 1244960), (20, 1058216), (31, 682720), (32, 661385), (34, 622480), (40, 529108), (62, 341360), (68, 311240), (80, 264554), (85, 248992), (124, 170680), (136, 155620), (155, 136544), (160, 132277), (170, 124496), (248, 85340), (251, 84320), (272, 77810), (310, 68272), (340, 62248), (496, 42670), (502, 42160), (527, 40160), (544, 38905), (620, 34136), (680, 31124), (992, 21335), (1004, 21080), (1054, 20080), (1240, 17068), (1255, 16864), (1360, 15562), (2008, 10540), (2108, 10040), (2480, 8534), (2510, 8432), (2635, 8032), (2720, 7781), (4016, 5270), (4216, 5020), (4267, 4960)]