21179860

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{53}}^2$

素因数の和:157

約数の個数: 72

約数和(自身を含む): 50503320

約数和(自身を除く): 29323460

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 29, 52, 53, 58, 65, 106, 116, 130, 145, 212, 260, 265, 290, 377, 530, 580, 689, 754, 1060, 1378, 1508, 1537, 1885, 2756, 2809, 3074, 3445, 3770, 5618, 6148, 6890, 7540, 7685, 11236, 13780, 14045, 15370, 19981, 28090, 30740, 36517, 39962, 56180, 73034, 79924, 81461, 99905, 146068, 162922, 182585, 199810, 325844, 365170, 399620, 407305, 730340, 814610, 1058993, 1629220, 2117986, 4235972, 5294965, 10589930, 21179860]

約数ペア:

[(1, 21179860), (2, 10589930), (4, 5294965), (5, 4235972), (10, 2117986), (13, 1629220), (20, 1058993), (26, 814610), (29, 730340), (52, 407305), (53, 399620), (58, 365170), (65, 325844), (106, 199810), (116, 182585), (130, 162922), (145, 146068), (212, 99905), (260, 81461), (265, 79924), (290, 73034), (377, 56180), (530, 39962), (580, 36517), (689, 30740), (754, 28090), (1060, 19981), (1378, 15370), (1508, 14045), (1537, 13780), (1885, 11236), (2756, 7685), (2809, 7540), (3074, 6890), (3445, 6148), (3770, 5618)]