21840208

素因数分解:

$2^4\times {\mathrm{13}}^2\times {\mathrm{41}}^1\times {\mathrm{197}}^1$

素因数の和:272

約数の個数: 60

約数和(自身を含む): 47176668

約数和(自身を除く): 25336460

約数列:

[1, 2, 4, 8, 13, 16, 26, 41, 52, 82, 104, 164, 169, 197, 208, 328, 338, 394, 533, 656, 676, 788, 1066, 1352, 1576, 2132, 2561, 2704, 3152, 4264, 5122, 6929, 8077, 8528, 10244, 13858, 16154, 20488, 27716, 32308, 33293, 40976, 55432, 64616, 66586, 105001, 110864, 129232, 133172, 210002, 266344, 420004, 532688, 840008, 1365013, 1680016, 2730026, 5460052, 10920104, 21840208]

約数ペア:

[(1, 21840208), (2, 10920104), (4, 5460052), (8, 2730026), (13, 1680016), (16, 1365013), (26, 840008), (41, 532688), (52, 420004), (82, 266344), (104, 210002), (164, 133172), (169, 129232), (197, 110864), (208, 105001), (328, 66586), (338, 64616), (394, 55432), (533, 40976), (656, 33293), (676, 32308), (788, 27716), (1066, 20488), (1352, 16154), (1576, 13858), (2132, 10244), (2561, 8528), (2704, 8077), (3152, 6929), (4264, 5122)]