20921172485

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{248869}}^1$

素因数の和:248957

約数の個数: 32

約数和(自身を含む): 28383125760

約数和(自身を除く): 7461953275

約数列:

[1, 5, 17, 23, 43, 85, 115, 215, 391, 731, 989, 1955, 3655, 4945, 16813, 84065, 248869, 1244345, 4230773, 5723987, 10701367, 21153865, 28619935, 53506835, 97307779, 181923239, 246131441, 486538895, 909616195, 1230657205, 4184234497, 20921172485]

約数ペア:

[(1, 20921172485), (5, 4184234497), (17, 1230657205), (23, 909616195), (43, 486538895), (85, 246131441), (115, 181923239), (215, 97307779), (391, 53506835), (731, 28619935), (989, 21153865), (1955, 10701367), (3655, 5723987), (4945, 4230773), (16813, 1244345), (84065, 248869)]