21000481225

素因数分解:

$5^2\times {\mathrm{17}}^2\times {\mathrm{29}}^1\times {\mathrm{73}}^1\times {\mathrm{1373}}^1$

素因数の和:1519

約数の個数: 72

約数和(自身を含む): 29029514760

約数和(自身を除く): 8029033535

約数列:

[1, 5, 17, 25, 29, 73, 85, 145, 289, 365, 425, 493, 725, 1241, 1373, 1445, 1825, 2117, 2465, 6205, 6865, 7225, 8381, 10585, 12325, 21097, 23341, 31025, 34325, 35989, 39817, 41905, 52925, 100229, 105485, 116705, 179945, 199085, 209525, 396797, 501145, 527425, 583525, 611813, 676889, 899725, 995425, 1703893, 1983985, 2505725, 2906641, 3059065, 3384445, 8519465, 9919925, 11507113, 14533205, 15295325, 16922225, 28966181, 42597325, 49412897, 57535565, 72666025, 144830905, 247064485, 287677825, 724154525, 840019249, 1235322425, 4200096245, 21000481225]

約数ペア:

[(1, 21000481225), (5, 4200096245), (17, 1235322425), (25, 840019249), (29, 724154525), (73, 287677825), (85, 247064485), (145, 144830905), (289, 72666025), (365, 57535565), (425, 49412897), (493, 42597325), (725, 28966181), (1241, 16922225), (1373, 15295325), (1445, 14533205), (1825, 11507113), (2117, 9919925), (2465, 8519465), (6205, 3384445), (6865, 3059065), (7225, 2906641), (8381, 2505725), (10585, 1983985), (12325, 1703893), (21097, 995425), (23341, 899725), (31025, 676889), (34325, 611813), (35989, 583525), (39817, 527425), (41905, 501145), (52925, 396797), (100229, 209525), (105485, 199085), (116705, 179945)]