21421275

素因数分解:

$3^1\times 5^2\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{317}}^1$

素因数の和:400

約数の個数: 48

約数和(自身を含む): 38327904

約数和(自身を除く): 16906629

約数列:

[1, 3, 5, 15, 17, 25, 51, 53, 75, 85, 159, 255, 265, 317, 425, 795, 901, 951, 1275, 1325, 1585, 2703, 3975, 4505, 4755, 5389, 7925, 13515, 16167, 16801, 22525, 23775, 26945, 50403, 67575, 80835, 84005, 134725, 252015, 285617, 404175, 420025, 856851, 1260075, 1428085, 4284255, 7140425, 21421275]

約数ペア:

[(1, 21421275), (3, 7140425), (5, 4284255), (15, 1428085), (17, 1260075), (25, 856851), (51, 420025), (53, 404175), (75, 285617), (85, 252015), (159, 134725), (255, 84005), (265, 80835), (317, 67575), (425, 50403), (795, 26945), (901, 23775), (951, 22525), (1275, 16801), (1325, 16167), (1585, 13515), (2703, 7925), (3975, 5389), (4505, 4755)]